Alkoxy substituted imidazoquinolines

ABSTRACT

Imidazoquinoline compounds with an alkoxy substituent at the 6, 7, 8, or 9-position, pharmaceutical compositions containing the compounds, intermediates, methods of making, and methods of use of these compounds as immunomodulators, for inducing or inhibiting cytokine biosynthesis in animals and in the treatment of diseases including viral, and neoplastic, are disclosed.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional of application Ser. No. 10/595,230, filed Mar. 28, 2006, now allowed, which is a National Stage filing of International Application No. PCT/US2004/032616, filed Oct. 1, 2004, which claims priority to U.S. Provisional Patent Application Ser. No. 60/508,634, filed on Oct. 3, 2003, each of which is incorporated herein by reference.

BACKGROUND

In the 1950's the 1H-imidazo[4,5-c]quinoline ring system was developed, and 1-(6-methoxy-8-quinolinyl)-2-methyl-1H-imidazo[4,5-c]quinoline was synthesized for possible use as an antimalarial agent. Subsequently, syntheses of various substituted 1H-imidazo[4,5-c]quinolines were reported. For example, 1-[2-(4-piperidyl)ethyl]-1H-imidazo[4,5-c]quinoline was synthesized as a possible anticonvulsant and cardiovascular agent. Also, several 2-oxoimidazo[4,5-c]quinolines have been reported.

Certain 1H-imidazo[4,5-c]quinolin-4-amines and 1- and 2-substituted derivatives thereof were later found to be useful as antiviral agents, bronchodilators and immunomodulators. Subsequently, certain substituted 1H-imidazo[4,5-c]pyridin-4-amine, quinolin-4-amine, tetrahydroquinolin-4-amine, naphthyridin-4-amine, and tetrahydronaphthyridin-4-amine compounds as well as certain analogous thiazolo and oxazolo compounds were synthesized and found to be useful as immune response modifiers (IRMs), rendering them useful in the treatment of a variety of disorders.

There continues to be interest in and a need for compounds that have the ability to modulate the immune response, by induction of cytokine biosynthesis or other mechanisms.

SUMMARY

A new class of compounds useful for modulating cytokine biosynthesis has now been found. In one aspect, the present invention provides such compounds, which are of Formula I:

wherein R, n, R′, R″, and R₃ are as defined below; and pharmaceutically acceptable salts thereof.

The compounds of the present invention are useful as immune response modifiers (IRMs) due to their ability to induce or inhibit cytokine biosynthesis (e.g., induce or inhibit the biosynthesis or production of one or more cytokines) and otherwise modulate the immune response when administered to animals. Compounds can be tested per the test procedures described in the Examples Section. Compounds can be tested for induction of cytokine biosynthesis by incubating human peripheral blood mononuclear cells (PBMC) in a culture with the compound(s) at a concentration range of 30 to 0.014 μM and analyzing for interferon (α) or tumor necrosis factor (a) in the culture supernatant. Compounds can be tested for inhibition of cytokine biosynthesis by incubating mouse macrophage cell line Raw 264.7 in a culture with the compound(s) at a single concentration of, for example, 5 μM and analyzing for tumor necrosis factor (α) in the culture supernatant. The ability to modulate cytokine biosynthesis, for example, induce the biosynthesis of one or more cytokines, makes the compounds useful in the treatment of a variety of conditions such as viral diseases and neoplastic diseases, that are responsive to such changes in the immune response.

In another aspect, the present invention provides pharmaceutical compositions containing the immune response modifier compounds, and methods of inducing or inhibiting cytokine biosynthesis in an animal, treating a viral disease in an animal, and treating a neoplastic disease in an animal, by administering an effective amount of one or more compounds of Formula I and/or pharmaceutically acceptable salts thereof to the animal.

In another aspect, the invention provides methods of synthesizing compounds of Formula I and intermediates useful in the synthesis of these compounds.

As used herein, “a,” “an,” “the,” “at least one,” and “one or more” are used interchangeably.

The terms “comprising” and variations thereof do not have a limiting meaning where these terms appear in the description and claims.

The above summary of the present invention is not intended to describe each disclosed embodiment or every implementation of the present invention. The description that follows more particularly exemplifies illustrative embodiments. Guidance is also provided herein through lists of examples, which can be used in various combinations. In each instance, the recited list serves only as a representative group and should not be interpreted as an exclusive list.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS OF THE INVENTION

The present invention provides such compounds of the following Formula I:

wherein R, n, R′, R″, and R₃ are as defined below; and pharmaceutically acceptable salts thereof.

Examples of compounds of Formula I are more specifically defined by the following Formulas II-VIII:

wherein R, R₁, R₂, R₃₋₁, R₃₋₂, R₃₋₃, R₃₋₄, R₃₋₅, R₃₋₆, and n are as defined below; and pharmaceutically acceptable salts thereof.

The compounds of Formula VIII and salts thereof are also useful as intermediates for the preparation of compounds and salts of Formulas I-VII. The present invention also provides intermediate compounds of Formula IX:

wherein R, R₁, R₂, R₃, and n are as defined below.

In one aspect, the present invention provides compounds of the formula (I):

wherein:

R₃ is selected from the group consisting of

-   -   —Z—Y—R₄,     -   —Z—Y—X—Y—R₄,     -   —Z—R₅,     -   —Z-Het,     -   —Z-Het′-R₄, and     -   —Z-Het′-Y—R₄;

Z is selected from the group consisting of alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups;

Y is selected from the group consisting of

-   -   —S(O)₀₋₂—,     -   —S(O)₂—N(R₈)—,     -   —C(R₆)—,     -   —C(R₆)—O—,     -   —O—C(R₆)—,     -   —O—C(O)—O—,     -   —N(R₈)-Q-,     -   —C(R₆)—N(R₈)—,     -   —O—C(R₆)—N(R₈)—,     -   —C(R₆)—N(OR₉)—,

X is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, heteroarylene, and heterocyclylene wherein the alkylene, alkenylene, and alkynylene groups can be optionally interrupted or terminated with arylene, heteroarylene, or heterocyclylene, and optionally interrupted by one or more —O— groups;

R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo;

R₅ is selected from the group consisting of

R₆ is selected from the group consisting of ═O and ═S;

R₇ is C₂₋₇ alkylene;

R₈ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and arylalkylenyl;

R₉ is selected from the group consisting of hydrogen and alkyl;

R₁₀ is C₃₋₈ alkylene;

A is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, and —N(R₄)—;

Het is heterocyclyl which can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, hydroxyalkyl, mercapto, cyano, aryloxy, arylalkyleneoxy, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, hydroxyalkyleneoxyalkylenyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and oxo;

Het′ is heterocyclylene which can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, hydroxyalkyl, mercapto, cyano, aryloxy, arylalkyleneoxy, heteroaryloxy, heteroarylalkyleneoxy, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and oxo;

Q is selected from the group consisting of a bond, —C(R₆)—, —C(R₆)—C(R₆)—, —S(O)₂—, —C(R₆)—N(R₈)—W—, —S(O)₂—N(R₈)—, —C(R₆)—O—, and —C(R₆)—N(OR₉)—;

V is selected from the group consisting of —C(R₆)—, —O—C(R₆)—, —N(R₈)—C(R₆)—, and —S(O)₂—;

W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—;

a and b are independently integers from 1 to 6 with the proviso that a+b is ≦7;

R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl;

n is 0 or 1; and

R′ and R″ are independently selected from the group consisting of hydrogen and non-interfering substitutents;

with the proviso that Z can also be a bond when:

-   -   R₃ is —Z-Het, —Z-Het′-R₄, or —Z-Het′-Y—R₄; or     -   R₃ is —Z—Y—R₄ or —Z—Y—X—Y—R₄, and Y is selected from —S(O)₀₋₂—,         —S(O)₂—N(R₈)—, —C(R₆)—, —C(R₆)—O—, —C(R₆)—N(R₈)—,

or

-   -   R₃ is —Z—R₅ and R₅ is

or a pharmaceutically acceptable salt thereof.

In one embodiment, the present invention provides compounds of the formula (II):

wherein:

R₃ is selected from the group consisting of

-   -   —Z—Y—R₄,     -   —Z—Y—X—Y—R₄,     -   —Z—R₅,     -   —Z-Het,     -   —Z-Het′-R₄, and     -   —Z-Het′-Y—R₄;

Z is selected from the group consisting of alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups;

R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl;

n is 0 or 1;

R₁ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄,     -   —X—Y—X—Y—R₄, and     -   —X—R₅;

R₂ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄, and     -   —X—R₅;

X is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, heteroarylene, and heterocyclylene wherein the alkylene, alkenylene, and alkynylene groups can be optionally interrupted or terminated with arylene, heteroarylene, or heterocyclylene, and optionally interrupted by one or more —O— groups;

Y is selected from the group consisting of

-   -   —S(O)₀₋₂—,     -   —S(O)₂—N(R₈)—,     -   —C(R₆)—,     -   —C(R₆)—O—,     -   —O—C(R₆)—,     -   —O—C(O)—O—,     -   —N(R₈)-Q-,     -   —C(R₆)—N(R₈)—,     -   —O—C(R₆)—N(R₈)—,     -   —C(R₆)—N(OR₉)—,

R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo;

R₅ is selected from the group consisting of

R₆ is selected from the group consisting of ═O and ═S;

R₇ is C₂₋₇ alkylene;

R₈ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and arylalkylenyl;

R₉ is selected from the group consisting of hydrogen and alkyl;

R₁₀ is C₃₋₈ alkylene;

A is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, and —N(R₄)—;

Het is heterocyclyl which can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, hydroxyalkyl, mercapto, cyano, aryloxy, arylalkyleneoxy, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, hydroxyalkyleneoxyalkylenyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and oxo;

Het′ is heterocyclylene which can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, hydroxyalkyl, mercapto, cyano, aryloxy, arylalkyleneoxy, heteroaryloxy, heteroarylalkyleneoxy, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and oxo;

Q is selected from the group consisting of a bond, —C(R₆)—, —C(R₆)—C(R₆)—, —S(O)₂—, —C(R₆)—N(R₈)—W—, —S(O)₂—N(R₈)—, —C(R₆)—O—, and —C(R₆)—N(OR₉)—;

V is selected from the group consisting of —C(R₆)—, —O—C(R₆)—, —N(R₈)—C(R₆)—, and —S(O)₂—;

W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; and

a and b are independently integers from 1 to 6 with the proviso that a+b is ≦7;

with the proviso that Z can also be a bond when:

-   -   R₃ is —Z-Het, —Z-Het′-R₄, or —Z-Het′-Y—R₄; or     -   R₃ is —Z—Y—R₄ or —Z—Y—X—Y—R₄, and Y is selected from —S(O)₀₋₂—,         —S(O)₂—N(R₈)—, —C(R₆)—, —C(R₆)—O—, —C(R₆)—N(R₈)—,

or

-   -   R₃ is —Z—R₅ and R₅ is

or a pharmaceutically acceptable salt thereof.

In another embodiment, the present invention provides compounds of the formula (III):

wherein:

R₃₋₁ is selected from the group consisting of

-   -   —Z—N(R₈)—C(R₆)—R₄,

Z is selected from the group consisting of alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups;

R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl;

n is 0 or 1;

R₁ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄,     -   —X—Y—X—Y—R₄, and     -   —X—R₅;

R₂ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄, and     -   —X—R₅;

X is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, heteroarylene, and heterocyclylene wherein the alkylene, alkenylene, and alkynylene groups can be optionally interrupted or terminated with arylene, heteroarylene, or heterocyclylene, and optionally interrupted by one or more —O— groups;

Y is selected from the group consisting of

-   -   —S(O)₀₋₂—,     -   —S(O)₂—N(R₈)—,     -   —C(R₆)—,     -   —C(R₆)—O—,     -   —O—C(R₆)—,     -   —O—C(O)—O—,     -   —N(R₈)-Q-,     -   —C(R₆)—N(R₈)—,     -   —O—C(R₆)—N(R₈)—,     -   —C(R₆)—N(OR₉)—,

R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo;

R₅ is selected from the group consisting of

R₆ is selected from the group consisting of ═O and ═S;

R₇ is C₂₋₇ alkylene;

R₈ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and arylalkylenyl;

R₉ is selected from the group consisting of hydrogen and alkyl;

R₁₀ is C₃₋₈ alkylene;

A is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, and —N(R₄)—;

Q is selected from the group consisting of a bond, —C(R₆)—, —C(R₆)—C(R₆)—, —S(O)₂—, —C(R₆)—N(R₈)—W—, —S(O)₂—N(R₈)—, —C(R₆)—O—, and —C(R₆)—N(OR₉)—;

V is selected from the group consisting of —C(R₆)—, —O—C(R₆)—, —N(R₈)—C(R₆)—, and —S(O)₂—;

W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; and

a and b are independently integers from 1 to 6 with the proviso that a+b is ≦7;

with the proviso that Z can also be a bond when R₃₋₁ is

or a pharmaceutically acceptable salt thereof.

In another embodiment, the present invention provides compounds of the formula (IV):

wherein:

R₃₋₂ is selected from the group consisting of

-   -   —Z—N(R₈)—S(O)₂—R₄,     -   —Z—N(R₈)—S(O)₂—N(R₈)—R₄,

Z is selected from the group consisting of alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups;

R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl;

n is 0 or 1;

R₁ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄,     -   —X—Y—X—Y—R₄, and     -   —X—R₅;

R₂ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄, and     -   —X—R₅;

X is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, heteroarylene, and heterocyclylene wherein the alkylene, alkenylene, and alkynylene groups can be optionally interrupted or terminated with arylene, heteroarylene, or heterocyclylene, and optionally interrupted by one or more —O— groups;

Y is selected from the group consisting of

-   -   —S(O)₀₋₂—,     -   —S(O)₂—N(R₈)—,     -   —C(R₆)—O—,     -   —O—C(R₆)—,     -   —O—C(O)—O—,     -   —N(R₈)-Q-,     -   —C(R₆)—N(R₈)—,     -   —O—C(R₆)—N(R₈)—,     -   —C(R₆)—N(OR₉)—,

R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo;

R₅ is selected from the group consisting of

R₆ is selected from the group consisting of ═O and ═S;

R₇ is C₂₋₇ alkylene;

R₈ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and arylalkylenyl;

R₉ is selected from the group consisting of hydrogen and alkyl;

R₁₀ is C₃₋₈ alkylene;

A is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, and —N(R₄)—;

Q is selected from the group consisting of a bond, —C(R₆)—, —C(R₆)—C(R₆)—, —S(O)₂—, —C(R₆)—N(R₈)—W—, —S(O)₂—N(R₈)—, —C(R₆)—O—, and —C(R₆)—N(OR₉)—;

V is selected from the group consisting of —C(R₆)—, —O—C(R₆)—, —N(R₈)—C(R₆)—, and —S(O)₂—;

W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; and

a and b are independently integers from 1 to 6 with the proviso that a+b is ≦7;

with the proviso that Z can also be a bond when R₃₋₂ is

or a pharmaceutically acceptable salt thereof.

In another embodiment, the present invention provides compounds of the formula (V):

wherein:

R₃₋₃ is selected from the group consisting of

-   -   —Z—N(R₈)—C(R₆)—N(R₈)—W—R₄,

Z is selected from the group consisting of alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups;

R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl;

n is 0 or 1;

R₁ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄,     -   —X—Y—X—Y—R₄, and     -   —X—R₅;

R₂ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄, and     -   —X—R₅;

X is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, heteroarylene, and heterocyclylene wherein the alkylene, alkenylene, and alkynylene groups can be optionally interrupted or terminated with arylene, heteroarylene, or heterocyclylene, and optionally interrupted by one or more —O— groups;

Y is selected from the group consisting of

-   -   —S(O)₀₋₂—,     -   —S(O)₂—N(R₈)—,     -   —C(R₆)—O—,     -   —O—C(R₆)—,     -   —O—C(O)—O—,     -   —N(R₈)-Q-,     -   —C(R₆)—N(R₈)—,     -   —O—C(R₆)—N(R₈)—,     -   —C(R₆)—N(OR₉)—,

R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo;

R₅ is selected from the group consisting of

R₆ is selected from the group consisting of ═O and ═S;

R₇ is C₂₋₇ alkylene;

R₈ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and arylalkylenyl;

R₉ is selected from the group consisting of hydrogen and alkyl;

R₁₀ is C₃₋₈ alkylene;

A is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, and —N(R₄)—;

Q is selected from the group consisting of a bond, —C(R₆)—, —C(R₆)—C(R₆)—, —S(O)₂—, —C(R₆)—N(R₈)—W—, —S(O)₂—N(R₈)—, —C(R₆)—O—, and —C(R₆)—N(OR₉)—;

V is selected from the group consisting of —C(R₆)—, —O—C(R₆)—, —N(R₈)—C(R₆)—, and —S(O)₂—;

W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; and

a and b are independently integers from 1 to 6 with the proviso that a+b is ≦7;

with the proviso that Z can also be a bond when R₃₋₃ is

or a pharmaceutically acceptable salt thereof.

In another embodiment, the present invention provides compounds of the formula (VI):

wherein:

R₃₋₄ is selected from the group consisting of

-   -   —Z_(a)—C(R₆)—R₄,     -   —Z_(a)—C(R₆)—O—R₄,     -   —Z_(a)—C(R₆)—N(R₈)—R₄, and

Z_(a) is selected from the group consisting of a bond, alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups;

R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl;

n is 0 or 1;

R₁ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄,     -   —X—Y—X—Y—R₄, and     -   —X—R₅;

R₂ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄, and     -   —X—R₅;

X is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, heteroarylene, and heterocyclylene wherein the alkylene, alkenylene, and alkynylene groups can be optionally interrupted or terminated with arylene, heteroarylene, or heterocyclylene, and optionally interrupted by one or more —O— groups;

Y is selected from the group consisting of

-   -   —S(O)₀₋₂—,     -   —S(O)₂—N(R₈)—,     -   —C(R₆)—,     -   —C(R₆)—O—,     -   —O—C(R₆)—,     -   —O—C(O)—O—,     -   —N(R₈)-Q-,     -   —C(R₆)—N(OR₉)—,     -   —O—C(R₆)—N(R₈)—,     -   —C(R₆)—N(OR₉)—,

R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo;

R₅ is selected from the group consisting of

R₆ is selected from the group consisting of ═O and ═S;

R₇ is C₂₋₇ alkylene;

R₈ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and arylalkylenyl;

R₉ is selected from the group consisting of hydrogen and alkyl;

R₁₀ is C₃₋₈ alkylene;

A is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, and —N(R₄)—;

A′ is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, —N(R₄)—, and —CH₂—;

Q is selected from the group consisting of a bond, —C(R₆)—, —C(R₆)—C(R₆)—, —S(O)₂—, —C(R₆)—N(R₈)—W—, —S(O)₂—N(R₈)—, —C(R₆)—O—, and —C(R₆)—N(OR₉)—;

V is selected from the group consisting of —C(R₆)—, —O—C(R₆)—, —N(R₈)—C(R₆)—, and —S(O)₂—;

W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; and

a and b are independently integers from 1 to 6 with the proviso that a+b is ≦7;

or a pharmaceutically acceptable salt thereof.

In another embodiment, the present invention provides compounds of the formula (VII):

wherein:

R₃₋₅ is selected from the group consisting of

-   -   —Z—N(R₈)—C(R₆)—O—R₄;

and

-   -   —Z—N(R₈)—C(R₆)—C(R₆)—R₄;

Z is selected from the group consisting of alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups;

R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl;

n is 0 or 1;

R₁ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄,     -   —X—Y—X—Y—R₄, and     -   —X—R₅;

R₂ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄, and     -   —X—R₅;

X is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, heteroarylene, and heterocyclylene wherein the alkylene, alkenylene, and alkynylene groups can be optionally interrupted or terminated with arylene, heteroarylene, or heterocyclylene, and optionally interrupted by one or more —O— groups;

Y is selected from the group consisting of

-   -   —S(O)₀₋₂—,     -   —S(O)₂—N(R₆)—,     -   —C(R₆)—,     -   —C(R₆)—O—,     -   —O—C(R₆)—,     -   —O—C(O)—O—,     -   —N(R₈)-Q-,     -   —C(R₆)—N(R₈)—,     -   —O—C(R₆)—N(R₈)—,     -   —C(R₆)—N(OR₉)—,

R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo;

R₅ is selected from the group consisting of

R₆ is selected from the group consisting of ═O and ═S;

R₇ is C₂₋₇ alkylene;

R₈ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and arylalkylenyl;

R₉ is selected from the group consisting of hydrogen and alkyl;

R₁₀ is C₃₋₈ alkylene;

A is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, and —N(R₄)—;

Q is selected from the group consisting of a bond, —C(R₆)—, —C(R₆)—C(R₆)—, —S(O)₂—, —C(R₆)—N(R₈)—W—, —S(O)₂—N(R₈)—, —C(R₆)—O—, and —C(R₆)—N(OR₉)—;

V is selected from the group consisting of —C(R₆)—, —O—C(R₆)—, —N(R₈)—C(R₆)—, and —S(O)₂—;

W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; and

a and b are independently integers from 1 to 6 with the proviso that a+b is ≦7;

with the proviso that Z can also be a bond when R₃₋₅ is

or a pharmaceutically acceptable salt thereof.

In another embodiment, the present invention provides compounds of the formula (VIII):

wherein:

R₃₋₆ is selected from the group consisting of

-   -   —Z—N(R₈)H, and

Z is selected from the group consisting of alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups;

R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl;

n is 0 or 1;

R₁ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄,     -   —X—Y—X—Y—R₄, and     -   —X—R₅;

R₂ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄, and     -   —X—R₅;

X is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, heteroarylene, and heterocyclylene wherein the alkylene, alkenylene, and alkynylene groups can be optionally interrupted or terminated with arylene, heteroarylene, or heterocyclylene, and optionally interrupted by one or more —O— groups;

Y is selected from the group consisting of

-   -   —S(O)₀₋₂—,     -   —S(O)₂—N(R₈)—,     -   —C(R₆)—,     -   —C(R₆)—O—,     -   —O—C(R₆)—,     -   —O—C(O)—O—,     -   —N(R₈)-Q-,     -   —C(R₆)—N(R₈)—,     -   —O—C(R₆)—N(R₈)—,     -   —C(R₆)—N(OR₉)—,

R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo;

R₅ is selected from the group consisting of

R₆ is selected from the group consisting of ═O and ═S;

R₇ is C₂₋₇ alkylene;

R₈ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and arylalkylenyl;

R₉ is selected from the group consisting of hydrogen and alkyl;

R₁₀ is C₃₋₈ alkylene;

A is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, and —N(R₄)—;

Q is selected from the group consisting of a bond, —C(R₆)—, —C(R₆)—C(R₆)—, —S(O)₂—, —C(R₆)—N(R₈)—W—, —S(O)₂—N(R₈)—, —C(R₆)—O—, and —C(R₆)—N(OR₉)—;

V is selected from the group consisting of —C(R₆)—, —O—C(R₆)—, —N(R₈)—C(R₆)—, and —S(O)₂—;

W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; and

a and b are independently integers from 1 to 6 with the proviso that a+b is ≦7;

with the proviso that Z can also be a bond when R₃₋₆ is

or a pharmaceutically acceptable salt thereof.

The compounds of Formula VIII and salts thereof are also useful as intermediates for the preparation of compounds and salts of Formulas I-VII.

In another aspect, the present invention provides intermediate compounds of Formula IX:

wherein:

R₃ is selected from the group consisting of

-   -   —Z—Y—R₄,     -   —Z—Y—X—Y—R₄,     -   —Z—R₅,     -   —Z-Het,     -   —Z-Het′-R₄, and     -   —Z-Het′-Y—R₄;

Z is selected from the group consisting of alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups;

R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl;

n is 0 or 1;

R₁ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄,     -   —X—Y—X—Y—R₄, and     -   —X—R₅;

R₂ is selected from the group consisting of

-   -   —R₄,     -   —X—R₄,     -   —X—Y—R₄, and     -   —X—R₅;

X is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, heteroarylene, and heterocyclylene wherein the alkylene, alkenylene, and alkynylene groups can be optionally interrupted or terminated with arylene, heteroarylene, or heterocyclylene, and optionally interrupted by one or more —O— groups;

Y is selected from the group consisting of

-   -   —S(O)₀₋₂—,     -   —S(O)₂—N(R₈)—,     -   —C(R₆)—,     -   —C(R₆)—O—,     -   —O—C(R₆)—,     -   —O—C(O)—O—,     -   —N(R₈)-Q-,     -   —C(R₆)—N(R₈)—,     -   —O—C(R₆)—N(R₈)—,     -   —C(R₆)—N(OR₉)—,

R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo;

R₅ is selected from the group consisting of

R₆ is selected from the group consisting of ═O and ═S;

R₇ is C₂₋₇ alkylene;

R₈ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and arylalkylenyl;

R₉ is selected from the group consisting of hydrogen and alkyl;

R₁₀ is C₃₋₈ alkylene;

A is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, and —N(R₄)—;

Het is heterocyclyl which can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, hydroxyalkyl, mercapto, cyano, aryloxy, arylalkyleneoxy, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, hydroxyalkyleneoxyalkylenyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and oxo;

Het′ is heterocyclylene which can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, hydroxyalkyl, mercapto, cyano, aryloxy, arylalkyleneoxy, heteroaryloxy, heteroarylalkyleneoxy, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and oxo;

Q is selected from the group consisting of a bond, —C(R₆)—, —C(R₆)—C(R₆)—, —S(O)₂—, —C(R₆)—N(R₈)—W—, —S(O)₂—N(R₈)—, —C(R₆)—O—, and —C(R₆)—N(OR₉)—;

V is selected from the group consisting of —C(R₆)—, —O—C(R₆)—, —N(R₈)—C(R₆)—, and —S(O)₂—;

W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; and

a and b are independently integers from 1 to 6 with the proviso that a+b is ≦7;

with the proviso that Z can also be a bond when:

-   -   R₃ is —Z-Het, —Z-Het′-R₄, or —Z-Het′-Y—R₄; or     -   R₃ is —Z—Y—R₄ or —Z—Y—X—Y—R₄, and Y is selected from —S(O)₀₋₂—,     -   —S(O)₂—N(R₈)—, —C(R₆)—, —C(R₆)—O—, —C(R₆)—N(R₈)—,

-   -   R₃ is —Z—R₅ and R₅ is

or a pharmaceutically acceptable salt thereof.

Certain embodiments of the present invention include non-interfering substituents. For example, in certain embodiments, R′ and R″ are independently selected from the group consisting of hydrogen and non-interfering substitutents.

Herein, “non-interfering” means that the immunomodulator activity (for example, the ability to induce the biosynthesis of one or more cytokines or the ability to inhibit the biosynthesis of one or more cytokines) of the compound or salt is not destroyed. Illustrative non-interfering R′ groups include those described herein for R₁. Illustrative non-interfering R″ groups include those described herein for R₂.

As used herein, the terms “alkyl”, “alkenyl”, “alkynyl” and the prefix “alk-” are inclusive of both straight chain and branched chain groups and of cyclic groups, i.e. cycloalkyl and cycloalkenyl. Unless otherwise specified, these groups contain from 1 to 20 carbon atoms, with alkenyl groups containing from 2 to 20 carbon atoms, and alkynyl groups containing from 2 to 20 carbon atoms. In some embodiments, these groups have a total of up to 10 carbon atoms, up to 8 carbon atoms, up to 6 carbon atoms, or up to 4 carbon atoms. Cyclic groups can be monocyclic or polycyclic and preferably have from 3 to 10 ring carbon atoms. Exemplary cyclic groups include cyclopropyl, cyclopropylmethyl, cyclopentyl, cyclohexyl, adamantyl, and substituted and unsubstituted bornyl, norbornyl, and norbornenyl.

Unless otherwise specified, “alkylene,” “-alkylene-”, “alkenylene”, “-alkenylene-”, “alkynylene”, and “-alkynylene-” are the divalent forms of the “alkyl”, “alkenyl”, and “alkynyl” groups defined above. The terms “alkylenyl”, “alkenylenyl”, and “alkynylenyl” are used when “alkylene”, “alkenylene”, and “alkynylene”, respectively, are substituted. For example, an arylalkylenyl group comprises an “alkylene” moiety to which an aryl group is attached.

The term “haloalkyl” is inclusive of alkyl groups that are substituted by one or more halogen atoms, including perfluorinated groups. This is also true of other groups that include the prefix “halo-”. Examples of suitable haloalkyl groups are chloromethyl, trifluoromethyl, and the like.

The term “aryl” as used herein includes carbocyclic aromatic rings or ring systems. Examples of aryl groups include phenyl, naphthyl, biphenyl, fluorenyl and indenyl.

The term “heteroatom” refers to the atoms O, S, or N.

The term “heteroaryl” includes aromatic rings or ring systems that contain at least one ring heteroatom (e.g., O, S, N). Suitable heteroaryl groups include furyl, thienyl, pyridyl, quinolinyl, isoquinolinyl, indolyl, isoindolyl, triazolyl, pyrrolyl, tetrazolyl, imidazolyl, pyrazolyl, oxazolyl, thiazolyl, benzofuranyl, benzothiophenyl, carbazolyl, benzoxazolyl, pyrimidinyl, benzimidazolyl, quinoxalinyl, benzothiazolyl, naphthyridinyl, isoxazolyl, isothiazolyl, purinyl, quinazolinyl, pyrazinyl, 1-oxidopyridyl, pyridazinyl, triazinyl, tetrazinyl, oxadiazolyl, thiadiazolyl, and so on.

The term “heterocyclyl” includes non-aromatic rings or ring systems that contain at least one ring heteroatom (e.g., O, S, N) and includes all of the fully saturated and partially unsaturated derivatives of the above mentioned heteroaryl groups. Exemplary heterocyclic groups include pyrrolidinyl, tetrahydrofuranyl, morpholinyl, thiomorpholinyl, piperidinyl, piperazinyl, thiazolidinyl, imidazolidinyl, isothiazolidinyl, tetrahydropyranyl, quinuclidinyl, homopiperidinyl (azepanyl), homopiperazinyl (diazepanyl), 1,3-dioxolanyl, aziridinyl, dihydroisoquinolin-(1H)-yl, octahydroisoquinolin-(1H)-yl, dihydroquinolin-(2H)-yl, octahydroquinolin-(2H)-yl, dihydro-1H-imidazolyl, and the like. When “heterocyclyl” contains a nitrogen atom, the point of attachment of the heterocyclyl group may be the nitrogen atom.

The terms “arylene”, “heteroarylene”, and “heterocyclylene” are the divalent forms of the “aryl”, “heteroaryl”, and “heterocyclyl” groups defined above. The terms “arylenyl,” “heteroarylenyl,” and “heterocyclylenyl” are used when “arylene”, “heteroarylene”, and “heterocyclylene”, respectively, are substituted. For example, an alkylarylenyl group comprises an arylene moiety to which an alkyl group is attached.

When a group (or substituent or variable) is present more than once in any Formula described herein, each group (or substituent or variable) is independently selected, whether explicitly stated or not. For example, for the formula —N(R₈)—C(R₆)—N(R₈)— each R₈ group is independently selected. In another example, when an R₂ and an R₃ group both contain an R₄ group, each R₄ group is independently selected. In a further example, when more than one Y group is present (i.e., R₂ and R₃ both contain a Y group) and each Y group contains one or more R₈ groups, then each Y group is independently selected, and each R₈ group is independently selected.

The invention is inclusive of the compounds described herein in any of their pharmaceutically acceptable forms, including isomers (e.g., diastereomers and enantiomers), salts, solvates, polymorphs, and the like. In particular, if a compound is optically active, the invention specifically includes each of the compound's enantiomers as well as racemic mixtures of the enantiomers. It should be understood that the term “compound” includes any or all of such forms, whether explicitly stated or not (although at times, “salts” are explicitly stated).

For any of the compounds presented herein, each one of the following variables (e.g., R, R′, R″, R₁, R₂, R₃, n, A, X, Z, and so on) in any of its embodiments can be combined with any one or more of the other variables in any of their embodiments as would be understood by one of skill in the art. Each of the resulting combinations of variables is an embodiment of the present invention.

In some embodiments, compounds of Formula I-VIII induce the biosynthesis of one or more cytokines.

In some embodiments, compounds of Formula I-VIII inhibit the biosynthesis of one or more cytokines (e.g., TNF-α).

In certain embodiments, R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl.

In some embodiments of Formula I, R′ is selected from the group consisting of —R₄, —X—R₄, —X—Y—R₄, R₄—X—Y—X—Y—R₄, and X—Y—X—Y—R₄, and —X—R₅.

In some embodiments, R′ is selected from the group consisting of alkyl, arylalkylenyl, aryloxyalkylenyl, hydroxyalkyl, dihydroxyalkyl, alkylsulfonylalkylenyl, —X—Y—R₄, —X—R₈, and heterocyclylalkylenyl, wherein the heterocyclyl of the heterocyclylalkylenyl group is optionally substituted by one or more alkyl groups; wherein X is alkylene; Y is —N(R₈)—C(O)—, —N(R₈)—S(O)₂—, —N(R₈)—C(O)—N(R₈)—, or

R₄ is alkyl, aryl, or heteroaryl; and R₅ is

In certain embodiments, R′ is selected from the group consisting of alkyl, arylalkylenyl, aryloxyalkylenyl, hydroxyalkyl, alkylsulfonylalkylenyl, —X—Y—R₄, and —X—R₅; wherein X is alkylene; Y is —N(R₈)—C(O)—, —N(R₈)—S(O)₂—, —N(R₈)—C(O)—N(R₈)—, or

R₄ is alkyl, aryl, or heteroaryl; and R₅ is

In some embodiments of Formula I, R″ is selected from the group consisting of —R₄, —X—R₄, —X—Y—R₄, and —X—R₅. In some embodiments, R″ is selected from the group consisting of hydrogen, alkyl, and alkoxyalkylenyl. In some embodiments, R″ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and hydroxyalkylenyl.

In some embodiments, R₁ is selected from the group consisting of —R₄, —X—R₄, —X—Y—R₄, —X—Y—X—Y—R₄, and —X—R₅.

In some embodiments (e.g., of Formulas II-IX), R₁ is selected from the group consisting of alkyl, arylalkylenyl, aryloxyalkylenyl, hydroxyalkyl, dihydroxyalkyl, alkylsulfonylalkylenyl, —X—Y—R₄, —X—R₅, and heterocyclylalkylenyl, wherein the heterocyclyl of the heterocyclylalkylenyl group is optionally substituted by one or more alkyl groups; wherein X is alkylene; Y is —N(R₈)—C(O)—, —N(R₈)—S(O)₂—, —N(R₈)—C(O)—N(R₈)—, or

R₄ is alkyl, aryl, or heteroaryl; and R₅ is

In certain embodiments, R₁ is selected from the group consisting of alkyl, arylalkylenyl, aryloxyalkylenyl, hydroxyalkyl, alkylsulfonylalkylenyl, —X—Y—R₄, and —X—R₅; wherein X is alkylene; Y is —N(R₈)—C(O)—, —N(R₈)—S(O)₂—, —N(R₈)—C(O)—N(R₈)—, or

R₄ is alkyl, aryl, or heteroaryl; and R₅ is

In some embodiments (e.g., of Formulas II-IX), R₁ is selected from the group consisting of methyl, n-propyl, 2-methylpropyl, 2-phenylethyl, 2-phenoxyethyl, benzyl, 4-(methanesulfonylamino)butyl, 2-(methanesulfonylamino)-2-methylpropyl, 4-(benzenesulfonylamino)butyl, 2-(acetamido)-2-methylpropyl, 4-(ureido)butyl, 2-hydroxy-2-methylpropyl, 5-(methanesulfonyl)pentyl, 4-aminobutyl, 4-(3-phenylureido)butyl, 4-(benzoylamino)lbutyl, 4-[(4-morpholinecarbonyl)amino]butyl, 2-(1,1-dioxidoisothiazolidin-2-yl)ethyl, 3-(1,1-dioxidoisothiazolidin-2-yl)propyl, 4-(1,1-dioxidoisothiazolidin-2-yl)butyl, 2-(benzoylamino)-2-methylpropyl, 2-(3-phenylureido)butyl, 2-(2-oxopyrrolidin-1-yl)ethyl, 3-(2-oxopyrrolidin-1-yl)propyl, 4-(2-oxopyrrolidin-1-yl)butyl.

In some embodiments (e.g., of Formulas II-IX), R₁ is selected from the group consisting of 2-hydroxy-2-methylpropyl, 2-methylpropyl, propyl, ethyl, methyl, 2,3-dihydroxypropyl, 2-phenoxyethyl, 4-[(methylsulfonyl)amino]butyl, 2-methyl-2-[(methylsulfonyl)amino]propyl, 2-(acetylamino)-2-methylpropyl, 2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl, 4-{[(isopropylamino)carbonyl]amino}butyl, 4-(1,1-dioxidoisothiazolidin-2-yl)butyl, tetrahydro-2H-pyran-4-ylmethyl, and (2,2-dimethyl-1,3-dioxolan-4-yl)methyl.

In some embodiments, R₂ is selected from the group consisting of —R₄, —X—R₄, —X—Y—R₄, and —X—R₅.

In some embodiments (e.g., of Formulas II-IX), R₂ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and hydroxyalkylenyl. In some embodiments (e.g., of Formulas II-IX), R₂ is selected from the group consisting of hydrogen, alkyl, and alkoxyalkylenyl. In some embodiments, R₂ is selected from the group consisting of hydrogen, methyl, ethyl, propyl, butyl, ethoxymethyl, methoxymethyl, 2-methoxyethyl, hydroxymethyl, and 2-hydroxyethyl.

In some embodiments (e.g., of Formulas II-X), R₂ is selected from the group consisting of methyl, ethyl, n-propyl, n-butyl, ethoxymethyl, methoxyethyl, methoxymethyl, hydrogen, hydroxymethyl, 2-methoxy(ethoxymethyl), 4-(3-phenylureido)butyl, cyclopropylmethyl, trifluoromethyl, phenyl, and benzyl.

In certain embodiments of the present invention, R₃ is selected from the group consisting of —Z—Y—R₄, —Z—Y—X—Y—R₄, —Z—R₅, —Z-Het, —Z-Het′-R₄, and —Z-Het′-Y—R₄. In some embodiments (e.g., of Formulas I or II), R₃ is —Z—Y—R₄ or —Z—Y—X—Y—R₄. In some embodiments (e.g., of Formula I or II), R₃ is —Z—R₅. In some embodiments (e.g., of Formula I or II), R₃ is —Z-Het, —Z-Het′-R₄, or —Z-Het′-Y—R₄.

In certain embodiments, R₃ is —Z—Y—R₄ or —Z—Y—X—Y—R₄, wherein Y is selected from the group consisting of —S(O)₀₋₂—, —C(O)—, —C(O)—O—, —O—C(O)—, —N(R₈)-Q-, —C(R₆)—N(R₈),

wherein Q is selected from the group consisting of a bond, —C(O)—, —C(O)—O—, —S(O)₂—, —C(R₆)—N(R₈)—W—, and —S(O)₂—N(R₈)—; W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; R₆ is selected from the group consisting of ═O or ═S; R₈ is selected from the group consisting of hydrogen, C₁₋₄ alkyl, and alkoxyalkylenyl; and R₁₀ is selected from the group consisting of C₄₋₆ alkylene; X is selected from the group consisting of alkylene, arylene, heterocyclylene, heteroarylene, and alkylene terminated with heteroarylene; and R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, aryl, arylalkylenyl, alkylheteroarylenyl, heteroarylalkylenyl, aryloxyalkylenyl, heteroaryl, and heterocyclyl, wherein alkyl is unsubstituted or substituted by one or more substituents selected from the group consisting of hydroxy, alkoxy, and heterocyclyl, and wherein arylalkylenyl and heteroarylalkylenyl are unsubstituted or substituted by one or more substituents selected from the group consisting of alkyl, halogen, and alkoxy.

In certain embodiments, R₃ is —Z—Y—R₄ or —Z—Y—X—Y—R₄. In certain of these embodiments, Y is selected from the group consisting of —S(O)₀₋₂—, —C(O)—, —C(O)—O—, —N(R₈)-Q-, —C(R₆)—N(R₈),

wherein Q is selected from the group consisting of a bond, —C(O)—, —C(O)—O—, —S(O)₂—, —C(R₆)—N(R₈)—W—, and —S(O)₂—N(R₈)—; W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; R₆ is selected from the group consisting of ═O and ═S; R₈ is selected from the group consisting of hydrogen, C₁₋₄ alkyl, and alkoxyalkylenyl; and R₁₀ is a C₄₋₆ alkylene.

In some embodiments (e.g., of Formula II), R₃ is —Z—R₅, wherein R₅ is selected from the group consisting of

wherein R₇ is C₃₋₅ alkylene; R₁₀ is C₄₋₆ alkylene; and a and b are each independently 1 to 3.

In some embodiments (e.g., of Formula II), R₃ is —Z-Het, —Z-Het′-R₄, or —Z-Het′-Y—R₄. In certain of these embodiments, Het is substituted by one or more substituents selected from the group consisting of alkyl, hydroxy, hydroxyalkyl, hydroxyalkyleneoxylalkylenyl, diakylamino, and heterocyclyl. In certain of these embodiments, Y is selected from the group consisting of —C(O)—, —C(O)—O—, —C(O)—N(H)—, and —N(H)—C(O)—. In certain embodiments, Het or Het′ is selected from the group consisting of tetrahydropyranyl, tetrahydrofuranyl, 1,3-dioxolanyl, pyrrolidinyl, piperidinyl, morpholinyl, thiomorpholinyl, thiazolidinyl, aziridinyl, azepanyl, diazepanyl, dihydroisoquinolin-(1H)-yl, octahydroisoquinolin-(1H)-yl, dihydroquinolin-(2H)-yl, octahydroquinolin-(2H)-yl, dihydro-1H-imidazolyl, and piperazinyl. In certain embodiments Het is selected from the group consisting of tetrahydropyranyl and tetrahydrofuranyl.

In some embodiments of Formula III, R₃₋₁ is selected from the group consisting of —Z—N(R₈)—C(R₆)—R₄,

In some embodiments of Formula III, R₃₋₁ is —Z—N(R₈)—C(R₆)—R₄. In certain embodiments of this formula for R₃₁, Z is C₂₋₆ alkylene. In certain embodiments of this, R₈ is hydrogen, R₆ is ═O, and R₄ is selected from the group consisting of alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl wherein the alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl groups can be unsubstituted or substituted by one or more substituents selected from the group consisting of alkyl, aryl, halogen, alkoxy, cyano, arylalkyleneoxy, nitro, dialkylamino, aryloxy, heterocyclyl, trifluoromethyl, trifluoromethoxy, and in the case of alkyl, oxo. In certain embodiments of this, R₈ is hydrogen, R₆ is ═O, and R₄ is selected from the group consisting of alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl, wherein aryl can be optionally substituted with halogen, methoxy, cyano, trifluoromethyl, and trifluoromethoxy. In certain embodiments, Z is ethylene or propylene, R₈ is hydrogen, R₆ is ═O, and R₄ is C₁₋₃ alkyl.

In some embodiments of Formula III, R₃₋₁ is

In certain embodiments of this formula for R₃₋₁, Z is a bond. In certain embodiments of this, R₆ is ═O, R₁₀ is C₄₋₆ alkylene, and R₄ is selected from the group consisting of alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl, wherein the alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl groups can be unsubstituted or substituted by one or more substituents selected from the group consisting of alkyl, aryl, halogen, alkoxy, cyano, arylalkyleneoxy, nitro, dialkylamino, aryloxy, heterocyclyl, trifluoromethyl, trifluormethoxy, and in the case of alkyl, oxo. In certain embodiments, R₄ is alkyl or aryl.

In certain embodiments, R₃₋₁ is

In some embodiments of Formula III, R₃₋₁ is

In certain embodiments of this formula for R₃₋₁, R₆ is ═O, and R₇ is C₃₋₅ alkylene. In certain of these embodiments, Z is ethylene or propylene and R₇ is propylene.

In some embodiments of Formula IV, R₃₋₂ is selected from the group consisting of —Z—N(R₈)—S(O)₂—R₄, —Z—N(R₈)—S(O)₂—N(R₈)—R₄,

In some embodiments of Formula IV, R₃₋₂ is —Z—N(R₈)—S(O)₂—R₄. In certain embodiments of this formula for R₃₋₂, R₈ is hydrogen, and R₄ is selected from the group consisting of alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl, wherein the alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl groups can be unsubstituted or substituted by one or more substituents selected from the group consisting of alkyl, aryl, halogen, alkoxy, cyano, arylalkyleneoxy, nitro, dialkylamino, aryloxy, heterocyclyl, trifluoromethyl, trifluormethoxy, and in the case of alkyl, oxo. In certain embodiments, R₄ is selected from the group consisting of alkyl, aryl, alkenyl, heteroaryl, arylalkylenyl, and alkylheteroarylenyl; wherein aryl can be optionally substituted with halogen, methoxy, cyano, trifluoromethyl, and trifluoromethoxy. In certain embodiments, Z is ethylene or propylene, R₈ is hydrogen, and R₄ is C₁₋₃ alkyl.

In some embodiments of Formula IV, R₃₋₂ is

In certain embodiments of this formula for R₃₋₂, R₇ is C₃₋₅ alkylene.

In some embodiments of Formula IV, R₃₋₂ is

In certain embodiments of this formula for R₃₋₂, Z is a bond. In certain embodiments of this formula for R₃₋₂, R₁₀ is C₄₋₆ alkylene, and R₄ is selected from the group consisting of alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl, wherein the alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl groups can be unsubstituted or substituted by one or more substituents selected from the group consisting of alkyl, aryl, halogen, alkoxy, cyano, arylalkyleneoxy, nitro, dialkylamino, aryloxy, heterocyclyl, trifluoromethyl, trifluormethoxy, and in the case of alkyl, oxo. In certain of these embodiments, R₄ is selected from the group consisting of alkyl, aryl, heteroaryl, arylalkylenyl, and alkylheteroarylenyl, wherein aryl can be optionally substituted with halogen, methoxy, cyano, trifluoromethyl, trifluoromethoxy.

In certain embodiments, R₃₋₂ is

In some embodiments of Formula IV, R₃₋₂ is —Z—N(R₈)—S(O)₂—N(R₈)—R₄ or

In certain embodiments of this formula for R₃₋₂, R₁₀ is C₄₋₆ alkylene, R₈ is hydrogen or C₁₋₄ alkyl, and R₄ is alkyl.

In certain embodiments R₃₋₂ is

and Z is a bond.

In some embodiments, R₃₋₃ is selected from the group consisting of —Z—N(R₈)—C(R₆)—N(R₈)—W—R₄,

In some embodiments of Formula V, R₃₋₃ is —Z—N(R₈)—C(R₆)—N(R₈)—W—R₄. In certain embodiments of this formula for R₃₋₃, R₆ is ═O or ═S, R₈ is hydrogen or C₁₋₄ alkyl, W is a bond, —C(O)—, or —S(O)₂—; and R₄ is selected from the group consisting of alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl, wherein the alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl groups can be unsubstituted or substituted by one or more substituents selected from the group consisting of alkyl, aryl, halogen, alkoxy, cyano, arylalkyleneoxy, nitro, dialkylamino, aryloxy, heterocyclyl, trifluoromethyl, trifluormethoxy, and in the case of alkyl, oxo. In certain embodiments, R₄ is selected from the group consisting of alkyl, aryl, arylalkylenyl, and heteroaryl; wherein aryl can be optionally substituted with halogen, methoxy, cyano, trifluoromethyl, and trifluoromethoxy. In certain embodiments, Z is ethylene or propylene, each R₈ is hydrogen, R₆ is ═O, and R₄ is isopropyl.

In some embodiments of Formula V, R₃₋₃ is

In certain embodiments of this formula for R₃₋₃, R₆ is ═O, R₈ is hydrogen, a and b are each independently 1 to 3, and A is —O—. In certain of these embodiments, Z is ethylene or propylene, and a and b are each 2.

In some embodiments of Formula V, R₃₋₃ is

In certain embodiments of this formula for R₃₋₃, R₆ is ═O, R₁₀ is C₄₋₆ alkylene, a and b are each independently 1 to 3, and A is —O—. In certain embodiments, Z is a bond.

In certain embodiments, R₃₋₃ is

In some embodiments of Formula V, R₃₋₃ is

In certain embodiments of this formula for R₃₋₃, R₆ is ═O or ═S, R₈ is hydrogen or C₁₋₄ alkyl, R₁₀ is C₄₋₆ alkylene, W is a bond, —C(O)—, or —S(O)₂—, and R₄ is selected from the group consisting of alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl, wherein the alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl groups can be unsubstituted or substituted by one or more substituents selected from the group consisting of alkyl, aryl, halogen, alkoxy, cyano, arylalkyleneoxy, nitro, dialkylamino, aryloxy, heterocyclyl, trifluoromethyl, trifluormethoxy, and in the case of alkyl, oxo. In certain embodiments W is a bond or —C(O)—. In certain embodiments, R₄ is selected from the group consisting of alkyl, aryl, arylalkylenyl, and heteroaryl; wherein aryl can be optionally substituted with halogen, methoxy, cyano, trifluoromethyl, and trifluoromethoxy. In certain embodiments, Z is a bond.

In certain embodiments, R₃₋₃ is

In some embodiments of Formula V, R₃₋₃ is

In certain embodiments of this formula for R₃₋₃, R₆ is ═O or ═S, R₈ is hydrogen or C₁₋₄ alkyl, R₁₀ is C₄₋₆ alkylene, and R₄ is hydrogen or alkyl.

In some embodiments of Formula V, R₃₋₃ is

In certain embodiments of this formula for R₃₋₃, R₆ is ═O or ═S, R₁₀ is C₄₋₆ alkylene, and R₄ is hydrogen or alkyl. In certain embodiments, Z is a bond.

In some embodiments of Formula V, R₃₋₃ is

In certain embodiments of this formula for R₃₋₃, R₆ is ═O or ═S, R₇ is C₂₋₄ alkylene, W is a bond, and R₄ is hydrogen or alkyl.

In some embodiments of Formula VI, R₃₋₄ is —Z_(a)—C(R₆)—R₄, —Z_(a)—C(R₆)—O—R₄, —Z_(a)—C(R₆)—N(R₈)—R₄, or

In some embodiments of Formula VI, R₃₋₄ is —Z_(a)—C(R₆)—R₄. In certain embodiments of this formula for R₃₋₄, R₆ is ═O or ═S, and R₄ is alkyl, aryl, or heterocyclyl.

In some embodiments of Formula VI, R₃₋₄ is —Z_(a)—C(R₆)—O—R₄. In certain embodiments of this formula for R₃₋₄, R₆ is ═O and R₄ is hydrogen or alkyl.

In some embodiments of Formula VI, R₃₋₄ is —Z_(a)—C(R₆)—N(R₈)—R₄. In certain embodiments of this formula for R₃₋₄, R₆ is ═O or ═S, R₈ is hydrogen, alkyl, or alkoxyalkylenyl, and R₄ is alkyl, aryl, or arylalkylenyl; wherein aryl can be optionally substituted with halogen, methoxy, cyano, trifluoromethyl, and trifluoromethoxy.

In some embodiments of Formula VI, R₃₋₄ is

In certain embodiments of this formula for R₃₋₄, R₆ is ═O or ═S, a and b are each independently 1 to 3, and A′ is selected from the group consisting of —CH₂—, —S(O)₂—, and —O—. In certain embodiments A′ is —CH₂—. In certain of these embodiments, Z_(a) is methylene, R₆ is ═O, a is 1 or 2, b is 2, and A′ is —CH₂—. In certain of these embodiments, Z_(a) is methylene, R₆ is ═O, a and b are each 2, and A′ is —O—.

In certain embodiments of Formula VI, Z_(a) is a bond or alkylene.

In some embodiments of Formula VII, R₃₋₅ is —Z—N(R₈)—C(R₆)—O—R₄,

or —Z—N(R₈)—C(R₆)—C(R₆)—R₄.

In some embodiments of Formula VII, R₃₋₅ is —Z—N(R₈)—C(R₆)—O—R₄. In certain embodiments of this formula for R₃₋₅, R₆ is ═O, R₈ is hydrogen, and R₄ is alkyl.

In some embodiments of Formula VII, R₃₋₅ is

In certain embodiments of this formula for R₃₋₅, R₆ is ═O, R₁₀ is C₄₋₆ alkylene, and R₄ is alkyl. In certain embodiments, Z is a bond.

In some embodiments of Formula VII, R₃₋₅ is —Z—N(R₈)—C(R₆)—C(R₆)—R₄. In certain embodiments of this formula for R₃₋₅, R₆ is ═O or ═S, R₈ is hydrogen, and R₄ is alkyl, aryl, or heteroaryl; wherein aryl can be optionally substituted with halogen, methoxy, cyano, trifluoromethyl, and trifluoromethoxy.

In some embodiments of Formula VIII, R₃₋₆ is —Z—N(R₈)H

or

In some embodiments of Formula VIII, R₃₋₆ is —Z—N(R₈)H. In certain embodiments of this formula for R₃₋₆, Z is alkylene, and R₈ is hydrogen.

In some embodiments of Formula VIII, R₃₋₆ is

In certain embodiments of this formula for R₃₋₆, Z is a bond, and R₁₀ is C₄₋₆ alkylene.

In certain embodiments, R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo.

In certain embodiments, R₄ is selected from the group consisting of alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl, wherein the alkyl, alkenyl, aryl, arylalkylenyl, aryloxyalkylenyl, and heteroaryl groups can be unsubstituted or substituted by one or more substituents selected from the group consisting of alkyl, aryl, halogen, alkoxy, cyano, arylalkyleneoxy, nitro, dialkylamino, aryloxy, heterocyclyl, trifluoromethyl, trifluormethoxy, and in the case of alkyl, oxo.

In certain embodiments, R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, aryl, arylalkylenyl, alkylheteroarylenyl, heteroarylalkylenyl, aryloxyalkylenyl, heteroaryl, and heterocyclyl, wherein alkyl is unsubstituted or substituted by one or more substituents selected from the group consisting of hydroxy, alkoxy, and heterocyclyl, and wherein arylalkylenyl and heteroarylalkylenyl are unsubstituted or substituted by one or more substituents selected from the group consisting of alkyl, halogen, and alkoxy.

In certain embodiments, R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, aryl, arylalkylenyl, alkylheteroarylenyl, heteroarylalkylenyl, aryloxyalkylenyl, heteroaryl, and heterocyclyl.

In certain embodiments, R₄ is selected from the group consisting of hydrogen and alkyl. In certain embodiments, R₄ is alkyl. In certain embodiments, R₄ is alkyl or aryl. In certain embodiments, R₄ is C₁₋₃ alkyl. In certain embodiments, R₄ is isopropyl.

In certain embodiments, R₄ is alkyl, aryl, or heterocyclyl. In certain embodiments, R₄ is alkyl, aryl, or heteroaryl, wherein aryl can be optionally substituted with halogen, methoxy, cyano, trifluoromethyl, and trifluoromethoxy.

In certain embodiments, R₄ is selected from the group consisting of alkyl, aryl, alkenyl, heteroaryl, arylalkylenyl, and alkylheteroarylenyl; wherein aryl can be optionally substituted with halogen, methoxy, cyano, trifluoromethyl, and trifluoromethoxy.

In certain embodiments, R₄ is alkyl, aryl, or arylalkylenyl; wherein aryl can be optionally substituted with halogen, methoxy, cyano, trifluoromethyl, and trifluoromethoxy.

In certain embodiments, R₅ is selected from the group consisting of

In certain embodiments, R₅ is selected from the group consisting of

In certain of these embodiments, R₇ is C₃₋₅ alkylene; R₁₀ is C₄₋₆ alkylene; and a and b are each independently 1 to 3.

In certain embodiments, R₆ is selected from the group consisting of ═O and ═S. In certain embodiments, R₆ is ═O.

In certain embodiments, R₇ is a C₂₋₇ alkylene. In certain embodiments, R₇ is C₃₋₅ alkylene. In certain embodiments, R₇ is C₂₋₄ alkylene. In certain embodiments, R₇ is propylene.

In certain embodiments, R₈ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and arylalkylenyl. In certain embodiments, R₈ is selected from the group consisting of hydrogen, C₁₋₄ alkyl, and alkoxyalkylenyl. In certain embodiments, R₈ is hydrogen or C₁₋₄ alkyl. In certain embodiments, R₈ is hydrogen.

In certain embodiments, R₉ is selected from the group consisting of hydrogen and alkyl.

In certain embodiments, R₁₀ is a C₃₋₈ alkylene. In certain embodiments, R₁₀ is a C₄₋₆ alkylene. In certain embodiments, R₁₀ is butylene.

In certain embodiments, A is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, and —N(R₄)—. In certain embodiments, A is —O—.

In certain embodiments, A′ is selected from the group consisting of —O—, —C(O)—, —S(O)₀₋₂—, —N(R₄)—, and —CH₂—. In certain embodiments, A′ is selected from the group consisting of —CH₂—, —S(O)₂—, and —O—. In certain embodiments, A′ is —CH₂—. In certain embodiments, A′ is —O—.

In certain embodiments, Q is selected from the group consisting of a bond, —C(R₆)—, —C(R₆)—C(R₆)—, —S(O)₂—, —C(R₆)—N(R₈)—W—, —S(O)₂—N(R₈)—, —C(R₆)—O—, and —C(R₆)—N(OR₉)—. In certain embodiments, Q is selected from the group consisting of a bond, —C(O)—, —C(O)—O—, —S(O)₂—, —C(R₆)—N(R₈)—W—, and —S(O)₂—N(R₈)—.

In certain embodiments, V is selected from the group consisting of —C(R₆)—, —O—C(R₆)—, —N(R₈)—C(R₆)—, and —S(O)₂—. In certain embodiments, V is selected from the group consisting of —C(O)— and —N(R₈)—C(O)—.

In certain embodiments, W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—. In certain embodiments, W is a bond or —C(O)—. In certain embodiments, W is a bond.

In certain embodiments, X is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, heteroarylene, and heterocyclylene wherein the alkylene, alkenylene, and alkynylene groups can be optionally interrupted or terminated with arylene, heteroarylene, or heterocyclylene, and optionally interrupted by one or more —O— groups.

In certain embodiments, X is selected from the group consisting of alkylene, arylene, heterocyclylene, heteroarylene, and alkylene terminated with heteroarylene. In certain embodiments, X is selected from the group consisting of alkylene, arylene, heteroarylene, and alkylene terminated with heteroarylene.

In certain embodiments, Y is selected from the group consisting of —S(O)₀₋₂—, —S(O)₂—N(R₈)—, —C(R₆)—, —C(R₆)—O—, —O—C(R₆)—, —O—C(O)—O—, —N(R₈)-Q-, —C(R₆)—N(R₈)—, —O—C(R₆)—N(R₈)—, —C(R₆)—N(OR₉)—,

In certain embodiments, Y is selected from the group consisting of —S(O)₀₋₂—, —C(O)—, —C(O)—O—, —O—C(O)—, —N(R₈)-Q-, —C(R₆)—N(R₈)—,

wherein Q is selected from the group consisting of a bond, —C(O)—, —C(O)—O—, —S(O)₂—, —C(R₆)—N(R₈)—W—, and —S(O)₂—N(R₈)—; W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; R₆ is selected from the group consisting of ═O or ═S; R₈ is selected from the group consisting of hydrogen, C₁₋₄ alkyl, and alkoxyalkylenyl; and R₁₀ is selected from the group consisting of C₄₋₆ alkylene; X is selected from the group consisting of alkylene, arylene, heterocyclylene, heteroarylene, and alkylene terminated with heteroarylene; and R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, aryl, arylalkylenyl, alkylheteroarylenyl, heteroarylalkylenyl, aryloxyalkylenyl, heteroaryl, and heterocyclyl, wherein alkyl is unsubstituted or substituted by one or more substituents selected from the group consisting of hydroxy, alkoxy, and heterocyclyl, and wherein arylalkylenyl and heteroarylalkylenyl are unsubstituted or substituted by one or more substituents selected from the group consisting of alkyl, halogen, and alkoxy.

In certain embodiments, Y is selected from the group consisting of —S(O)₀₋₂—, —C(O)—, —C(O)—O—, —O—C(O)—, —N(R₈)-Q-, —C(R₆)—N(R₈)—,

In certain of these embodiments, Q is selected from the group consisting of a bond, —C(O)—, —C(O)—O—, —S(O)₂—, —C(R₆)—N(R₈)—W—, and —S(O)₂—N(R₈)—; W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; R₆ is selected from the group consisting of ═O or ═S; R₈ is selected from the group consisting of hydrogen, C₁₋₄ alkyl, and alkoxyalkylenyl; and R₁₀ is selected from the group consisting of C₄₋₆ alkylene.

In certain embodiments, Y is selected from the group consisting of —S(O)₀₋₂—, —C(O)—, —C(O)—O—, —N(R₈)-Q-, —C(R₆)—N(R₈),

In certain embodiments, Y is selected from the group consisting of —C(O)—, —C(O)—O—, —C(O)—N(H)—, and —N(H)—C(O)—.

In certain embodiments, Z is selected from the group consisting of alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups. Z can also be a bond. In some embodiments (e.g., of Formulas I-IX), Z is alkylene. In certain of these embodiments, Z is C₂₋₆ alkylene. In certain embodiments Z is ethylene or propylene.

In certain embodiments, Z is a bond. For example, Z can be a bond when: R₃ is —Z-Het, —Z-Het′-R₄, or —Z-Het′-Y—R₄; or R₃ is —Z—Y—R₄ or —Z—Y—X—Y—R₄, and Y is selected from —S(O)₀₋₂—, —S(O)₂—N(R₈)—, —C(R₆)—, —C(R₆)—O—, —C(R₆)—N(R₈)—,

or R₃ is —Z—R₅ and R₅ is

As another example, Z can be a bond when R₃₋₁ is

As another example, Z can be a bond when R₃₋₂ is

As another example, Z can be a bond when R₃₋₃ is

As another example, Z can be a bond when R₃₋₅ is

As another example, Z can be a bond when R₃₋₆ is

As another example, Z can be a bond when R₃ is —Z—S(O)₂—CH₃ or —Z—C(O)—NH—CH(CH₃)₂.

In certain embodiments, Z_(a) is selected from the group consisting of a bond, alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups. In certain embodiments, Z_(a) is a bond or alkylene. In certain of these embodiments, Z_(a) is C₁₋₄ alkylene. In certain embodiments, Z_(a) is methylene.

In certain embodiments, Het is heterocyclyl which can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, hydroxyalkyl, mercapto, cyano, aryloxy, arylalkyleneoxy, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, hydroxyalkyleneoxyalkylenyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and oxo. In certain embodiments, Het is substituted by one or more substituents selected from the group consisting of alkyl, hydroxy, hydroxyalkyl, hydroxyalkyleneoxylalkylenyl, diakylamino, and heterocyclyl. In certain embodiments, Het is selected from the group consisting of tetrahydropyranyl and tetrahydrofuranyl.

In certain embodiments, Het is heterocyclyl which can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, hydroxyalkyl, mercapto, cyano, aryloxy, arylalkyleneoxy, heteroaryloxy, heteroarylalkyleneoxy, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and oxo.

In certain embodiments, Het′ is heterocyclylene which can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, hydroxyalkyl, mercapto, cyano, aryloxy, arylalkyleneoxy, heteroaryloxy, heteroarylalkyleneoxy, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and oxo.

In certain embodiments, Het or Het′ is selected from the group consisting of tetrahydropyranyl, tetrahydrofuranyl, 1,3-dioxolanyl, pyrrolidinyl, piperidinyl, morpholinyl, thiomorpholinyl, thiazolidinyl, aziridinyl, azepanyl, diazepanyl, dihydroisoquinolin-(1H)-yl, octahydroisoquinolin-(1H)-yl, dihydroquinolin-(2H)-yl, octahydroquinolin-(2H)-yl, dihydro-1H-imidazolyl, and piperazinyl.

In certain embodiments, Het is substituted by one or more substituents selected from the group consisting of alkyl, hydroxy, hydroxyalkyl, hydroxyalkyleneoxylalkylenyl, diakylamino, and heterocyclyl; Y is selected from the group consisting of —C(O)—, —C(O)—O—, —C(O)—N(H)—, and —N(H)—C(O)—; and R₄ is selected from the group consisting of hydrogen and alkyl.

In some embodiments of Formulas I-IX, R₃—O—, R₃₋₁—O—, R₃₋₂—O—, R₃₋₃—O—, R₃₋₄—O—, R₃₋₅—O—, or R₃₋₆—O— is at the 7- or 8-position. In some embodiments of Formulas I-IX, R₃—O—, R₃₋₁—O—, R₃₋₂—O—, R₃₋₃—O—, R₃₋₄—O—, R₃₋₅—O—, or R₃₋₆—O— is at the 7-position. In some embodiments of Formulas I-IX, R₃—O—, R₃₋₁—O—, R₃₋₂—O—, R₃₋₃—O—, R₃₋₄—O—, R₃₋₅—O—, or R₃₋₆—O— is at the 8-position.

In certain embodiments, a and b are independently integers from 1 to 6 with the proviso that a+b is ≦7. In certain embodiments, a and b are each independently 1 to 3.

In certain embodiments, a is 1 or 2, and b is 2. In certain embodiments, a and b are each 2.

In certain embodiments, n is 0 or 1. In some embodiments (e.g., of Formulas I-IX), n is 0.

Preparation of the Compounds

Compounds of the invention can be prepared according to Reaction Scheme I where R, R₁, R₂, R₃, and n are as defined above. In step (1) of Reaction Scheme I, a benzyloxyaniline of Formula XV is treated with the condensation product generated from 2,2-dimethyl-1,3-dioxane-4,6-dione (Meldrum's acid) and triethyl orthoformate to provide an imine of Formula XVI. The reaction is conveniently carried out by adding a solution of a benzyloxyaniline of Formula XV to a heated mixture of Meldrum's acid and triethyl orthoformate and heating the reaction at an elevated temperature such as 45° C. The product can be isolated using conventional methods.

In step (2) of Reaction Scheme I, an imine of Formula XVI undergoes thermolysis and cyclization to provide a benzyloxyquinolin-4-ol of Formula XVII. The reaction is conveniently carried out in medium such as DOWTHERM A heat transfer fluid at a temperature between 200 and 250° C. The product can be isolated using conventional methods.

In step (3) of Reaction Scheme I, the benzyloxyquinolin-4-ol of Formula XVII is nitrated under conventional nitration conditions to provide a benzyloxy-3-nitroquinolin-4-ol of Formula XVIII. The reaction is conveniently carried out by adding nitric acid to the benzyloxyquinolin-4-ol of Formula XVII in a suitable solvent such as propionic acid and heating the mixture at an elevated temperature such as 125° C. The product can be isolated using conventional methods.

In step (4) of Reaction Scheme I, a benzyloxy-3-nitroquinolin-4-ol of Formula XVIII is chlorinated using conventional chlorination chemistry to provide a benzyloxy-4-chloro-3-nitroquinoline of Formula XIX. The reaction is conveniently carried out by treating the benzyloxy-3-nitroquinolin-4-ol of Formula XVIII with phosphorous oxychloride in a suitable solvent such as N,N-dimethylformamide (DMF). The reaction can be carried out at an elevated temperature such as 100° C., and the product can be isolated using conventional methods.

In step (5) of Reaction Scheme I, a benzyloxy-4-chloro-3-nitroquinoline of Formula XIX is treated with an amine of Formula R₁—NH₂ to provide a benzyloxy-3-nitroquinolin-4-amine of Formula XX. The reaction is conveniently carried out by adding the amine of Formula R₁—NH₂ to a solution of the benzyloxy-4-chloro-3-nitroquinoline of Formula XIX in a suitable solvent such as dichloromethane or methanol in the presence of a tertiary amine such as triethylamine. The reaction can be carried out at ambient temperature or at an elevated temperature such as, for example, the reflux temperature of the solvent. The reaction product can be isolated using conventional methods. Several amines of Formula R₁—NH₂ are commercially available; others can be prepared by known synthetic methods. For example, methyl tetrahydro-2H-pyran-4-carboxylate treated with ammonium hydroxide to form tetrahydro-2H-pyran-4-carboxamide, which can then be reduced with lithium aluminum hydride to provide tetrahydro-2H-pyran-4-ylmethylamine.

In step (6) of Reaction Scheme I, a benzyloxy-3-nitroquinolin-4-amine of Formula XX is reduced to provide a benzyloxyquinoline-3,4-diamine of Formula XXI. The reaction can be carried out by hydrogenation using a heterogeneous hydrogenation catalyst such as platinum on carbon. The hydrogenation is conveniently carried out in a Parr apparatus in a suitable solvent such as toluene, methanol, or acetonitrile. The reaction can be carried out at ambient temperature, and the product can be isolated using conventional methods.

Alternatively, the reduction in step (6) can be carried out using nickel boride, prepared in situ from sodium borohydride and nickel(II) chloride. The reduction is conveniently carried out by adding a solution of the benzyloxy-3-nitroquinolin-4-amine of Formula XX in a suitable solvent or solvent mixture such as dichloromethane/methanol to a mixture of excess sodium borohydride and catalytic nickel(II) chloride in methanol. The reaction can be carried out at ambient temperature. The product can be isolated using conventional methods.

In step (7) of Reaction Scheme I, a benzyloxyquinoline-3,4-diamine of Formula XXI is treated with a carboxylic acid equivalent to provide a benzyloxy-1H-imidazo[4,5-c]quinoline of Formula XXII. Suitable carboxylic acid equivalents include orthoesters of Formula R₂C(O-alkyl)₃, 1,1-dialkoxyalkyl alkanoates of Formula R₂C(O-alkyl)₂(O—C(O)-alkyl), and acid chlorides of Formula R₂C(O)Cl. The selection of the carboxylic acid equivalent is determined by the desired substituent at R₂. For example, triethyl orthoformate will provide a compound where R₂ is hydrogen, and trimethyl orthovalerate will provide a compound where R₂ is a butyl group. The reaction is conveniently carried out by adding the carboxylic acid equivalent to a benzyloxyquinoline-3,4-diamine of Formula XXI in a suitable solvent such as toluene or xylenes. Optionally, catalytic pyridine hydrochloride can be added. The reaction is carried out at a temperature high enough to drive off alcohol or water formed during the reaction. Conveniently, a Dean-Stark trap can be used to collect the volatiles.

Alternatively, step (7) can be carried out in two steps when an acid chloride of Formula R₂C(O)Cl is used as the carboxylic acid equivalent. Part (i) of step (7) is conveniently carried out by adding the acid chloride to a solution of a benzyloxyquinoline-3,4-diamine of Formula XXI in a suitable solvent such as dichloromethane or acetonitrile to afford an amide. Optionally, a tertiary amine such as triethylamine, pyridine, or 4-dimethylaminopyridine can be added. The reaction can be carried out at ambient temperature or at an elevated temperature. The amide product can be isolated and optionally purified using conventional techniques. Part (ii) of step (7) involves heating the amide prepared in part (i) to provide a benzyloxy-1H-imidazo[4,5-c]quinoline of Formula XXII. The reaction is conveniently carried out in a suitable solvent such as toluene at a temperature sufficient to drive off water formed during the reaction. The reaction can also be carried out in a solvent such as ethanol or methanol in the presence of a base such as triethylamine. The benzyloxy-1H-imidazo[4,5-c]quinoline of Formula XXII can be isolated using conventional methods.

In step (8) of Reaction Scheme I, the benzyl group of a benzyloxy-1H-imidazo[4,5-c]quinoline of Formula XXII is cleaved to provide a 1H-imidazo[4,5-c]quinolinol of Formula XXIII. The cleavage is conveniently carried out on a Parr apparatus under hydrogenolysis conditions using a suitable heterogeneous catalyst such as palladium on carbon in a solvent such as ethanol. Alternatively, the reaction can be carried out by transfer hydrogenation in the presence of a suitable hydrogenation catalyst. The transfer hydrogenation is conveniently carried out by adding ammonium formate to a solution of a benzyloxy-1H-imidazo[4,5-c]quinoline of Formula XXII in a suitable solvent such as ethanol in the presence of a catalyst such as palladium on carbon. The reaction is carried out at an elevated temperature, for example, the refluxing temperature of the solvent. The product or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

In step (9) of Reaction Scheme I a 1H-imidazo[4,5-c]quinolinol of Formula XXIII is converted to an ether-substituted 1H-imidazo[4,5-c]quinoline of Formula IX using a Williamson-type ether synthesis. The reaction is effected by treating a 1H-imidazo[4,5-c]quinolinol of Formula XXIII with an alkyl halide of Formula Halide-Z—Y—R₄, Halide-Z—R₅, Halide-Z—Y—X—Y—R₄, or Halide-Z-Het, wherein Z, Y, X, R₄, R₅, and Het are as defined above, in the presence of a base. The reaction is conveniently carried out by combining the alkyl halide with a 1H-imidazo[4,5-c]quinolinol of Formula XXIII in a solvent such as DMF in the presence of a suitable base such as cesium carbonate. The reaction can be carried out at ambient temperature or at an elevated temperature, for example 65° C. or 85° C. Alternatively, the reaction can be carried out by treating a solution of a 1H-imidazo[4,5-c]quinolinol of Formula XXIII in a solvent such as DMF with sodium hydride and then adding a reagent of Formula Halide-Z—Y—R₄, Halide-Z—R₈, Halide-Z—Y—X—Y—R₄, or Halide-Z-Het. The product or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

Numerous reagents of Formulas Halide-Z—Y—R₄ and Halide-Z-Het are commercially available, for example, bromo-substituted ketones, esters, and heterocycles. Other reagents of Formulas Halide-Z—Y—R₄, Halide-Z—R₈, Halide-Z—Y—X—Y—R₄, and Halide-Z-Het can be prepared using conventional synthetic methods; for example, a bromo-substituted acid halide of Formula ClC(O)—Z—Br or BrC(O)—Z—Br can be treated with a secondary amine in a suitable solvent such as dichloromethane to provide a variety of bromo-substituted amides of Formula Br—Z—C(O)—N(R₈)—R₄ or

wherein R₈, a, b, and A′ are as defined above. The reaction can be run at a sub-ambient temperature such as −25° C., and the product can be isolated using conventional methods.

Step (9) of Reaction Scheme I can alternatively be carried out by treating a 1H-imidazo[4,5-c]quinolinol of Formula XXIII with an alcohol of Formula HO—Z—Y—R₄, HO—Z—R₅, or HO—Z-Het under Mitsunobu reaction conditions. Numerous alcohols of these formulas are commercially available, and others can be prepared using conventional synthetic methods. The reaction is conveniently carried out by out by adding triphenylphosphine and an alcohol of Formula HO—Z—Y—R₄, HO—Z-Het, or HO—Z—R₅, for example, 1-(2-hydroxyethyl)pyrrolidin-2-one or 1-(3-hydroxypropyl)pyrrolidin-2-one, to a solution of a 1H-imidazo[4,5-c]quinolinol of Formula XXIII in a suitable solvent such as tetrahydrofuran and then slowly adding diisopropyl azodicarboxylate or diethyl azodicarboxylate. The reaction can be carried out at ambient temperature or at a sub-ambient temperature, such as 0° C. The product can be isolated using conventional methods.

In step (10) of Reaction Scheme I, an ether-substituted 1H-imidazo[4,5-c]quinoline of Formula IX is oxidized to provide a 1H-imidazo[4,5-c]quinoline-5N-oxide of Formula X using a conventional oxidizing agent capable of forming N-oxides. The reaction is conveniently carried out by adding 3-chloroperoxybenzoic acid to a solution of a compound of Formula IX in a solvent such as dichloromethane or chloroform. The reaction can be carried out at ambient temperature, and the product can be isolated using conventional methods.

In step (11) of Reaction Scheme I, a 1H-imidazo[4,5-c]quinoline-5N-oxide of Formula X is aminated to provide a 1H-imidazo[4,5-c]quinolin-4-amine of Formula II. Step (11) can be carried out by the activation of an N-oxide of Formula X by conversion to an ester and then reacting the ester with an aminating agent. Suitable activating agents include alkyl- or arylsulfonyl chlorides such as benzenesulfonyl chloride, methanesulfonyl chloride, or p-toluenesulfonyl chloride. Suitable aminating agents include ammonia, in the form of ammonium hydroxide, for example, and ammonium salts such as ammonium carbonate, ammonium bicarbonate, and ammonium phosphate. The reaction is conveniently carried out by adding ammonium hydroxide to a solution of the N-oxide of Formula X in a suitable solvent such as dichloromethane or chloroform and then adding p-toluenesulfonyl chloride. The reaction can be carried out at ambient temperature. The product or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

Alternatively step (11) can be carried out by the reaction of a 1H-imidazo[4,5-c]quinoline-5N-oxide of Formula X with trichloroacetyl isocyanate followed by base-promoted hydrolysis of the resulting intermediate to provide a 1H-imidazo[4,5-c]quinolin-4-amine of Formula II. The reaction is conveniently carried out in two steps by (i) adding trichloroacetyl isocyanate to a solution of the N-oxide of Formula X in a solvent such as dichloromethane and stirring at ambient temperature to provide an isolable amide intermediate. In step (ii), a solution of the intermediate in methanol is treated with a base such as sodium methoxide or ammonium hydroxide at ambient temperature. The product or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

Steps (10) and (11) can alternatively be combined and carried out as a one-pot procedure by adding 3-chloroperoxybenzoic acid to a solution of a compound of Formula IX in a solvent such as dichloromethane or chloroform and then adding ammonium hydroxide and p-toluenesulfonyl chloride without isolating the N-oxide of Formula X. The product of Formula II or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

Compounds of the invention can also be prepared according to Reaction Scheme II, where R, R₁, R₂, R₃, and n are as defined above. In Reaction Scheme II, a benzyloxy-1H-imidazo[4,5-c]quinoline of Formula XXII is first oxidized to a benzyloxy-1H-imidazo[4,5-c]quinoline-5N-oxide of Formula XXIV, which is then aminated in step (2) to provide a benzyloxy-1H-imidazo[4,5-c]quinolin-4-amine of Formula XXV. In step (3) of Reaction Scheme II, the benzyl group of the benzyloxy-1H-imidazo[4,5-c]quinolin-4-amine of Formula XXV is cleaved to provide a 1H-imidazo[4,5-c]quinolinol of Formula XXVI, which is converted in step (4) to an ether-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula II. Steps (1), (2), (3), and (4) of Reaction Scheme II can be carried out as described for steps (10), (11), (8), and (9), respectively, of Reaction Scheme I.

For some embodiments, compounds shown in Reaction Scheme I can be further elaborated using conventional synthetic methods. For example, an amine of Formula R₁—NH₂, used in step (5) of Reaction Scheme I, may be substituted by a hydroxy or second amino group, which can be further functionalized before step (6) of Reaction Scheme I. For example, a benzyloxy-3-nitroquinolin-4-amine of Formula XX, in which R₁ has an amino substituent, can react with an acid chloride of Formula R₄C(O)Cl, a sulfonyl chloride of Formula R₄S(O)₂Cl, a sulfonic anhydride of Formula (R₄S(O)₂)₂O, or an isocyanate of Formula R₄N═C═O to provide a compound of Formula XX in which R₁ is —X—Y—R₄, where X and R₄ are as defined above, and Y is —N(R₈)-Q-, where R₈ is as defined above and Q is —C(O)—, —SO₂—, or —C(O)—NH—. Numerous acid chlorides, sulfonyl chlorides, sulfonic anhydrides, and isocyanates are commercially available; others can be readily prepared using known synthetic methods. The reaction can be conveniently carried out by adding the sulfonic anhydride to a solution of a benzyloxy-3-nitroquinolin-4-amine of Formula XX, in which R₁ has an amino substituent, and a base such as triethylamine in a suitable solvent such as dichloromethane. The reaction can be carried out at ambient temperature. The product can then be treated according to steps (6) and (7) of Reaction Scheme I to provide a benzyloxy-1H-imidazo[4,5-c]quinoline of Formula XXII, which can be treated as described in steps (8)-(11) of Reaction Scheme I or steps (1)-(4) of Reaction Scheme II to provide a compound of Formula II.

Amines of Formula R₁—NH₂, used in step (5) of Reaction Scheme I, may contain a protected functional group, such as a tert-butoxycarbonyl-protected amino group or a isopropylidene ketal-protected diol. The protecting group installed in step (5) may be removed later in Reaction Scheme I or Reaction Scheme II to reveal, for example, an amino substituent or a diol on the R₁ group. An amino group introduced in this manner may be functionalized as described above, if desired.

Functional groups can also be installed at R₁ using a variety of other known methods. See, for example, U.S. Pat. No. 4,689,338 (Gerster), U.S. Pat. No. 4,929,624 (Gerster et al.), U.S. Pat. No. 5,268,376 (Gerster), U.S. Pat. No. 5,389,640 (Gerster et al.), U.S. Pat. No. 6,331,539 (Crooks et al.), U.S. Pat. No. 6,451,810 (Coleman et al.), U.S. Pat. No. 6,541,485 (Crooks et al.), U.S. Pat. No. 6,660,747 (Crooks et al.), U.S. Pat. No. 6,670,372 (Charles et al.), U.S. Pat. No. 6,683,088 (Crooks et al.), U.S. Pat. No. 6,656,938 (Crooks et al.), U.S. Pat. No. 6,664,264 (Dellaria et al.), U.S. Pat. No. 6,677,349 (Griesgraber), and U.S. Pat. No. 6,664,260 (Charles et al.).

Synthetic transformations can be made at R₂ if, for example, the acid chloride used in step (7) of Reaction Scheme I contains a protected hydroxy or amino group. Several acid chlorides of this type, for example acetoxyacetyl chloride, are commercially available. Others can be prepared by known synthetic methods. In addition, a methoxyalkylenyl group at R₂ is conveniently converted to a hydroxyalkylenyl group using conventional methods. The demethylation can be carried out by treating a compound of Formula II wherein R₂ is a methoxyalkylenyl group with boron tribromide in a suitable solvent such as dichloromethane at a sub-ambient temperature such as 0° C. For other examples of synthetic elaborations of an R₂ group, see U.S. Pat. No. 5,389,640 (Gerster et al.).

Functional group transformations in an R₃ group are also possible using known synthetic methods. For example, a 1H-imidazo[4,5-c]quinoline of Formula IX in which R₃ is —Z—C(O)OH and Z is as defined above, can be converted to an amide of Formula IX in which R₃ is —Z—C(O)—N(R₈)—R₄,

wherein Z, R₁₀, R₈, R₄, a, b, and A are as defined above, using a coupling reagent. The reaction is conveniently carried out by treating a solution of the 1H-imidazo[4,5-c]quinoline of Formula IX, in which R₃ is —Z—C(O)OH, with a secondary amine and 1-[3-(dimethylamino)propyl-3-ethylcarbodiimide hydrochloride. The reaction can be carried out at ambient temperature in a suitable solvent such as pyridine, and the product can be treated according to steps (10) and (11) of Reaction Scheme I to provide a compound of Formula II.

In another example, an R₃ group in a compound of Formula IX may contain a —S-functional group, which can be oxidized to —S(O)₂— in step (10) of Reaction Scheme I using an excess of the oxidizing agent. Step (11) of Reaction Scheme I may then be carried out to provide a compound of Formula II, wherein R₃ contains a —S(O)₂— functional group.

For some embodiments, compounds of the invention can be prepared according to Reaction Scheme III, where R, R₁, R₂, R₈, and n are defined as above; Z is selected from the group consisting of alkylene, alkenylene, and alkynylene wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups; and R_(3a) is

—Z—N(R₈)-Q-R₄ or —Z—R₅, wherein R₅ is

In step (1) of Reaction Scheme III, the amine of an amino alcohol of Formula XXVII is protected with a tert-butoxy carbonyl (Boc) group to provide a hydroxyalkylcarbamate of Formula XXVIII. Numerous amino alcohols of Formula XXVII are commercially available; others can be prepared using known synthetic methods. The reaction is conveniently carried out by treating the amino alcohol of Formula XXVII with di-tert-butyl dicarbonate in the presence of a base such as aqueous sodium hydroxide. The reaction can be run at ambient temperature in a suitable solvent such as tetrahydrofuran, and the product can be isolated using conventional methods.

In step (2) of Reaction Scheme III, a hydroxyalkylcarbamate of Formula XXVIII is converted to an iodoalkylcarbamate of Formula XXIX using conventional methods. The reaction is conveniently carried out by treating the hydroxyalkylcarbamate of Formula XXVIII with a solution of iodine, triphenylphosphine, and imidazole. The reaction can be run at ambient temperature in a suitable solvent such as dichloromethane, and the product can be isolated using conventional methods.

In step (3) of Reaction Scheme III, a 1H-imidazo[4,5-c]quinolinol of Formula XXIII is treated with an iodoalkylcarbamate of Formula XXIX to provide an ether-substituted 1H-imidazo[4,5-c]quinoline of Formula XXX. The reaction can be carried out according to the Williamson conditions described in step (9) of Reaction Scheme I, and the product can be isolated using conventional methods.

In steps (4) and (5) of Reaction Scheme III, a 1H-imidazo[4,5-c]quinoline of Formula XXX is oxidized to a 1H-imidazo[4,5-c]quinoline-5N-oxide of Formula XXXI, which is aminated to provide a 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXII, which is a subgenus Formula VII. Steps (4) and (5) of Reaction Scheme III can be carried out as described for steps (10) and (11), respectively, of Reaction Scheme I. In step (5), the preferred conditions for animation are the activation of an N-oxide of Formula XXXI by conversion to an ester and then reacting the ester with an aminating agent. Step (5) is conveniently carried out by adding ammonium hydroxide to a solution of the N-oxide of Formula XXXI in a suitable solvent such as dichloromethane and then adding p-toluenesulfonyl chloride and stirring at ambient temperature. The product or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

In step (6) of Reaction Scheme III, the Boc protecting group of a 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXII is removed to provide an amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII, which is a subgenus of Formula VIII. The reaction is conveniently carried out by adding a solution of hydrochloric acid in ethanol to the 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXII. The reaction can be carried out at an elevated temperature, for example, the reflux temperature of the solvent. The product or pharmaceutically acceptable salt thereof can be isolated by conventional methods.

In step (7) of Reaction Scheme III, an amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII is converted to a 1H-imidazo[4,5-c]quinolin-1-yl compound of Formula IId, a subgenus of Formulas I and II, using conventional methods. For example, an amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII can react with an acid chloride of Formula R₄C(O)Cl to provide a compound of Formula IId in which R_(3a) is —Z—N(R₈)—C(O)—R₄. In addition, a 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII can react with sulfonyl chloride of Formula R₄S(O)₂Cl or a sulfonic anhydride of Formula (R₄S(O)₂)₂O to provide a compound of Formula IId in which R_(3a) is —Z—N(R₈)—S(O)₂—R₄. Numerous acid chlorides of Formula R₄C(O)Cl, sulfonyl chlorides of Formula R₄S(O)₂Cl, and sulfonic anhydrides of Formula (R₄S(O)₂)₂O are commercially available; others can be readily prepared using known synthetic methods. The reaction is conveniently carried out by adding the acid chloride of Formula R₄C(O)Cl, sulfonyl chloride of Formula R₄S(O)₂Cl, or sulfonic anhydride of Formula (R₄S(O)₂)₂O to a solution of the amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII in a suitable solvent such as chloroform, dichloromethane, or 1-methyl-2-pyrrolidinone. Optionally a base such as triethylamine can be added. The reaction can be carried out at ambient temperature or a sub-ambient temperature such as 0° C. The product or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

Amides of Formula IId can alternatively be prepared by treating an amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII with a carboxylic acid of Formula R₄C(O)OH in the presence of a coupling reagent. The reaction is conveniently carried out by adding a solution of a carboxylic acid of Formula R₄C(O)OH and a base such as triethylamine to a cooled solution of the amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII and benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate. The reaction can be carried out in a suitable solvent such as dichloromethane at a sub-ambient temperature such as 0° C. The product or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

Compounds of Formula IId where R_(3a) is —Z—R₅ and R₅ is

can be prepared by treating an amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII, wherein R₈ is hydrogen, with a chloroalkanesulfonyl chloride of Formula Cl—R₇S(O)₂Cl or a chloroalkanoyl chloride of Formula Cl—R₇C(O)Cl. The reaction is conveniently carried out by adding the chloroalkanesulfonyl chloride or chloroalkanoyl chloride to a solution of the amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII in a suitable solvent such as chloroform at ambient temperature. The isolable intermediate chloroalkanesulfonamide or chloroalkanamide can then be treated with a base such as 1,8-diazabicyclo[5.4.0]undec-7-ene in a suitable solvent such as DMF to effect the cyclization. The product or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

Ureas of Formula IId, where R_(3a) is —Z—N(R₈)-Q-R₄, Q is —C(R₆)—N(R₈)—W—, R₆ is ═O, R₈ is as defined above, and W is a bond, can be prepared by reacting an amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII with isocyanates of Formula R₄N═C═O, Numerous isocyanates of Formula R₄N═C═O are commercially available; others can be readily prepared using known synthetic methods. The reaction can be conveniently carried out by adding the isocyanate of Formula R₄N═C═O to a solution of the amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII in a suitable solvent such as dichloromethane or chloroform. Optionally a base such as triethylamine can be added. The reaction can be carried out at ambient temperature or a sub-ambient temperature such as 0° C. Alternatively, a compound of Formula XXXIII can be treated with an isocyanate of Formula R₄(CO)N═C═O, a thioisocyanate of Formula R₄N═C═S, a sulfonyl isocyanate of Formula R₄S(O)₂N═C═O, or a carbamoyl chloride of Formula R₄N—(R₈)—C(O)Cl or

to provide a compound of Formula IId, where R_(3a) is —Z—N(R₈)-Q-R₄ or

wherein R₄, A, Z, a, and b are defined as above and Q is —C(R₆)—N(R₈)—W—, where R₆, R₈, and W are defined as above. The product or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

Sulfamides of Formula IId, where R_(3a) is —Z—N(R₈)-Q-R₄, Q is —S(O)₂—N(R₈)—, and Z, R₄, and R₈ are as defined above, can be prepared by reacting a compound of Formula XXXIII with sulfuryl chloride to generate a sulfamoyl chloride in situ, and then reacting the sulfamoyl chloride with an amine of formula HN(R₈)R₄. Alternatively, sulfamides of Formula IId can be prepared by reacting a compound of Formula XXXIII with a sulfamoyl chloride of formula R₄(R₈)N—S(O)₂Cl. The product or a pharmaceutically acceptable salt thereof can be isolated using conventional methods. Many amines of Formula HN(R₈)R₄ and some sulfamoyl chlorides of formula R₄(R₈)N—S(O)₂Cl are commercially available; others can be prepared using known synthetic methods. The product or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

Compounds of Formula IId, wherein R_(3a) is —Z—N(R₈)—R₄, and Z, R₄, and R₈ are as defined above, can be prepared by reductive alkylation of the amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII, wherein R₈ is hydrogen. The alkylation is conveniently carried out in two parts by (i) adding an aldehyde or ketone to a solution of a amino-substituted 1H-imidazo[4,5-c]quinolin-4-amine of Formula XXXIII or a salt thereof in a suitable solvent such as DMF in the presence of a base such as N,N-diisopropylethylamine. In part (ii) the reduction is carried out by adding a suitable reducing agent such as the borane-pyridine complex. Both part (i) and part (ii) can be carried out at ambient temperature, and the product or pharmaceutically acceptable salt thereof can be isolated using conventional methods. In compounds of Formula XXXIII, wherein R₈ is hydrogen, it is convenient to carry out the reductive alkylation followed by reaction with an acid chloride, sulfonyl chloride, sulfonic anhydride, isocyanate, or carbamoyl chloride as described above to provide a compound of Formula IId, wherein R_(3a) is —Z—N(R₈)-Q-R₄, wherein Z, R₄, R₈, and Q are as defined above.

Compounds of the invention can be prepared according to Reaction Scheme IV, where R, R₁, R₂, R₁₀, and n are as defined above; Z_(a) is selected from the group consisting of a bond, alkylene, alkenylene, and alkynylene wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups; R_(3b) is

wherein R₄, R₆, A, Q, a, and b are as defined above. Steps (1) through (7) of Reaction Scheme IV can be run as described in steps (1) through (7) of Reaction Scheme III to provide compounds of Formula IIe, a subgenus of Formulas I and II.

Alternatively, a compound of Formula XXXV can react with a 1H-imidazo[4,5-c]quinolinol of Formula XXIII under the Mitsunobu reaction conditions described in step (9) of Reaction Scheme I. For example, combining a 1H-imidazo[4,5-c]quinolinol of Formula XXIII, triphenylphosphine, and tert-butyl 4-hydroxy-1-piperidinecarboxylate in THF at 5° C. or ambient temperature and slowly adding diisopropyl azodicarboxylate provides a compound of Formula XXXVII wherein Z_(a) is a bond and R₁₀ is pentylene.

The oxidation in step (4) of Reaction Scheme IV can be carried out according to the reaction conditions described in step (10) of Reaction Scheme I or by heating a solution of a compound of Formula XXXVII in a suitable solvent such as ethyl acetate with peracetic acid at a temperature such as 50° C. and then adding sodium metabisulfate. The product can be isolated using conventional methods. Steps (5) through (7) of Reaction Scheme IV can then be used to provide a compound of Formula IIe.

Compounds of the invention can also be prepared according to Reaction Scheme V, wherein R, R₁, R₂, and n are as defined above; Z is selected from the group consisting of alkylene, alkenylene, and alkynylene wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups; and R₃, is —Z-Het, —Z-Het′-R₄, or —Z-Het′-Y—R₄, wherein Het or Het′ is attached to Z at a nitrogen atom.

In step (1) of Reaction Scheme V, a 1H-imidazo[4,5-c]quinolinol of Formula XXVI is treated with a dihalide of Formula I—Z—Cl or Br—Z—Cl using the Williamson conditions described in step (9) of Reaction Scheme I to provide a chloro-substituted compound of Formula XLI, a subgenus of Formulas I and II. The product or pharmaceutically acceptable salt thereof can be isolated using conventional methods.

In step (2) of Reaction Scheme V, a chloro-substituted compound of Formula XLI is treated with a cyclic secondary amine to provide a compound of Formula IIf, a subgenus of Formulas I and II. Many cyclic secondary amines are commercially available, such as unsubstituted or substituted aziridines, pyrrolidines, piperidines, morpholines, thiazolidines, thiomorpholines, piperazines, azepanes, diazepanes, dihydroisoquinolines, octahydroisoquinolines, dihydroquinolines, octahydroquinolines, and dihydroimidazoles; others can be prepared using conventional methods. The reaction is conveniently carried out by adding a cyclic secondary amine to a compound of Formula XLI in a suitable solvent such as DMF. The reaction is conveniently carried out in the presence of a base such as potassium carbonate at an elevated temperature such as 65° C. The product of Formula IIf or a pharmaceutically acceptable salt thereof can be isolated by conventional methods.

Compounds of Formula IIf are also prepared from 1H-imidazo[4,5-c]quinolinols of Formula XXIII, shown in Reaction Scheme I. A 1H-imidazo[4,5-c]quinolinol of Formula XXIII is first treated with a dihalide of Formula I—Z—Cl or Br—Z—Cl according to step (1) of Reaction Scheme V. The product is then oxidized and aminated according to the methods described in steps (10) and (11) of Reaction Scheme I to provide a compound of Formula XLI, which is then treated with a cyclic secondary amine as described in step (2) of Reaction Scheme V to provide a compound of Formula IIf. The product or pharmaceutically acceptable salt thereof can be isolated by conventional methods.

Pharmaceutical Compositions and Biological Activity

Pharmaceutical compositions of the invention contain a therapeutically effective amount of a compound or salt of the invention as described above in combination with a pharmaceutically acceptable carrier.

The terms “a therapeutically effective amount” and “effective amount” mean an amount of the compound or salt sufficient to induce a therapeutic or prophylactic effect, such as cytokine induction, immunomodulation, antitumor activity, and/or antiviral activity. Although the exact amount of active compound or salt used in a pharmaceutical composition of the invention will vary according to factors known to those of skill in the art, such as the physical and chemical nature of the compound or salt, the nature of the carrier, and the intended dosing regimen, it is anticipated that the compositions of the invention will contain sufficient active ingredient to provide a dose of about 100 nanograms per kilogram (ng/kg) to about 50 milligrams per kilogram (mg/kg), preferably about 10 micrograms per kilogram (μg/kg) to about 5 mg/kg, of the compound or salt to the subject. A variety of dosage forms may be used, such as tablets, lozenges, capsules, parenteral formulations, syrups, creams, ointments, aerosol formulations, transdermal patches, transmucosal patches and the like.

The compounds or salts of the invention can be administered as the single therapeutic agent in the treatment regimen, or the compounds or salts of the invention may be administered in combination with one another or with other active agents, including additional immune response modifiers, antivirals, antibiotics, antibodies, proteins, peptides, oligonucleotides, etc.

Compounds or salts of the invention have been shown to induce or inhibit the production of certain cytokines in experiments performed according to the tests set forth below. These results indicate that the compounds or salts are useful as immune response modifiers that can modulate the immune response in a number of different ways, rendering them useful in the treatment of a variety of disorders.

Cytokines whose production may be induced by the administration of compounds or salts of the invention generally include interferon-α (IFN-α) and/or tumor necrosis factor-α (TNF-α) as well as certain interleukins (IL). Cytokines whose biosynthesis may be induced by compounds or salts of the invention include IFN-α, TNF-α, IL-1, IL-6, IL-10 and IL-12, and a variety of other cytokines. Among other effects, these and other cytokines can inhibit virus production and tumor cell growth, making the compounds or salts useful in the treatment of viral diseases and neoplastic diseases. Accordingly, the invention provides a method of inducing cytokine biosynthesis in an animal comprising administering an effective amount of a compound or salt or composition of the invention to the animal. The animal to which the compound or salt or composition is administered for induction of cytokine biosynthesis may have a disease as described infra, for example a viral disease or a neoplastic disease, and administration of the compound or salt may provide therapeutic treatment. Alternatively, the compound or salt may be administered to the animal prior to the animal acquiring the disease so that administration of the compound or salt may provide a prophylactic treatment.

In addition to the ability to induce the production of cytokines, compounds or salts of the invention can affect other aspects of the innate immune response. For example, natural killer cell activity may be stimulated, an effect that may be due to cytokine induction. The compounds or salts may also activate macrophages, which in turn stimulate secretion of nitric oxide and the production of additional cytokines. Further, the compounds or salts may cause proliferation and differentiation of B-lymphocytes.

Compounds or salts of the invention can also have an effect on the acquired immune response. For example, the production of the T helper type 1 (T_(H)1) cytokine IFN-γ may be induced indirectly and the production of the T helper type 2 (T_(H)2) cytokines IL-4, IL-5, and IL-13 may be inhibited upon administration of the compounds or salts.

Other cytokines whose production may be inhibited by the administration of compounds or salts of the invention include tumor necrosis factor-α (TNF-α). Among other effects, inhibition of TNF-α production can provide prophylaxis or therapeutic treatment of TNF-α mediated diseases in animals, making the compounds or salt useful in the treatment of, for example, autoimmune diseases. Accordingly, the invention provides a method of inhibiting TNF-α biosynthesis in an animal comprising administering an effective amount of a compound or salt or composition of the invention to the animal. The animal to which the compound or salt or composition is administered for inhibition of TNF-α biosynthesis may have a disease as described infra, for example an autoimmune disease, and administration of the compound or salt may provide therapeutic treatment. Alternatively, the compound or salt may be administered to the animal prior to the animal acquiring the disease so that administration of the compound or salt may provide a prophylactic treatment.

Whether for prophylaxis or therapeutic treatment of a disease, and whether for effecting innate or acquired immunity, the compound or salt or composition may be administered alone or in combination with one or more active components as in, for example, a vaccine adjuvant. When administered with other components, the compound or salt and other component or components may be administered separately; together but independently such as in a solution; or together and associated with one another such as (a) covalently linked or (b) non-covalently associated, e.g., in a colloidal suspension.

Conditions for which IRMs identified herein may be used as treatments include, but are not limited to:

(a) viral diseases such as, for example, diseases resulting from infection by an adenovirus, a herpesvirus (e.g., HSV-I, HSV-II, CMV, or VZV), a poxvirus (e.g., an orthopoxvirus such as variola or vaccinia, or molluscum contagiosum), a picornavirus (e.g., rhinovirus or enterovirus), an orthomyxovirus (e.g., influenzavirus), a paramyxovirus (e.g., parainfluenzavirus, mumps virus, measles virus, and respiratory syncytial virus (RSV)), a coronavirus (e.g., SARS), a papovavirus (e.g., papillomaviruses, such as those that cause genital warts, common warts, or plantar warts), a hepadnavirus (e.g., hepatitis B virus), a flavivirus (e.g., hepatitis C virus or Dengue virus), or a retrovirus (e.g., a lentivirus such as HIV);

(b) bacterial diseases such as, for example, diseases resulting from infection by bacteria of, for example, the genus Escherichia, Enterobacter, Salmonella, Staphylococcus, Shigella, Listeria, Aerobacter, Helicobacter, Klebsiella, Proteus, Pseudomonas, Streptococcus, Chlamydia, Mycoplasma, Pneumococcus, Neisseria, Clostridium, Bacillus, Corynebacterium, Mycobacterium, Campylobacter, Vibrio, Serratia, Providencia, Chromobacterium, Brucella, Yersinia, Haemophilus, or Bordetella;

(c) other infectious diseases, such chlamydia, fungal diseases including but not limited to candidiasis, aspergillosis, histoplasmosis, cryptococcal meningitis, or parasitic diseases including but not limited to malaria, pneumocystis carnii pneumonia, leishmaniasis, cryptosporidiosis, toxoplasmosis, and trypanosome infection;

(d) neoplastic diseases, such as intraepithelial neoplasias, cervical dysplasia, actinic keratosis, basal cell carcinoma, squamous cell carcinoma, renal cell carcinoma, Kaposi's sarcoma, melanoma, leukemias including but not limited to myelogeous leukemia, chronic lymphocytic leukemia, multiple myeloma, non-Hodgkin's lymphoma, cutaneous T-cell lymphoma, B-cell lymphoma, and hairy cell leukemia, and other cancers;

(e) T_(H)2-mediated, atopic diseases, such as atopic dermatitis or eczema, eosinophilia, asthma, allergy, allergic rhinitis, and Ommen's syndrome;

(f) certain autoimmune diseases such as systemic lupus erythematosus, essential thrombocythaemia, multiple sclerosis, discoid lupus, alopecia areata; and

(g) diseases associated with wound repair such as, for example, inhibition of keloid formation and other types of scarring (e.g., enhancing wound healing, including chronic wounds).

Additionally, an IRM compound or salt of the present invention may be useful as a vaccine adjuvant for use in conjunction with any material that raises either humoral and/or cell mediated immune response, such as, for example, live viral, bacterial, or parasitic immunogens; inactivated viral, tumor-derived, protozoal, organism-derived, fungal, or bacterial immunogens, toxoids, toxins; self-antigens; polysaccharides; proteins; glycoproteins; peptides; cellular vaccines; DNA vaccines; autologous vaccines; recombinant proteins; and the like, for use in connection with, for example, BCG, cholera, plague, typhoid, hepatitis A, hepatitis B, hepatitis C, influenza A, influenza B, parainfluenza, polio, rabies, measles, mumps, rubella, yellow fever, tetanus, diphtheria, hemophilus influenza b, tuberculosis, meningococcal and pneumococcal vaccines, adenovirus, HIV, chicken pox, cytomegalovirus, dengue, feline leukemia, fowl plague, HSV-1 and HSV-2, hog cholera, Japanese encephalitis, respiratory syncytial virus, rotavirus, papilloma virus, yellow fever, and Alzheimer's Disease.

Certain IRM compounds or salts of the present invention may be particularly helpful in individuals having compromised immune function. For example, certain compounds or salts may be used for treating the opportunistic infections and tumors that occur after suppression of cell mediated immunity in, for example, transplant patients, cancer patients and HIV patients.

Thus, one or more of the above diseases or types of diseases, for example, a viral disease or a neoplastic disease may be treated in an animal in need thereof (having the disease) by administering a therapeutically effective amount of a compound or salt of the invention to the animal.

An amount of a compound or salt effective to induce or inhibit cytokine biosynthesis is an amount sufficient to cause one or more cell types, such as monocytes, macrophages, dendritic cells and B-cells to produce an amount of one or more cytokines such as, for example, IFN-α, TNF-α, IL-1, IL-6, IL-10 and IL-12 that is increased (induced) or decreased (inhibited) over a background level of such cytokines. The precise amount will vary according to factors known in the art but is expected to be a dose of about 100 ng/kg to about 50 mg/kg, preferably about 10 μg/kg to about 5 mg/kg. The invention also provides a method of treating a viral infection in an animal and a method of treating a neoplastic disease in an animal comprising administering an effective amount of a compound or salt or composition of the invention to the animal. An amount effective to treat or inhibit a viral infection is an amount that will cause a reduction in one or more of the manifestations of viral infection, such as viral lesions, viral load, rate of virus production, and mortality as compared to untreated control animals. The precise amount that is effective for such treatment will vary according to factors known in the art but is expected to be a dose of about 100 ng/kg to about 50 mg/kg, preferably about 10 μg/kg to about 5 mg/kg. An amount of a compound or salt effective to treat a neoplastic condition is an amount that will cause a reduction in tumor size or in the number of tumor foci. Again, the precise amount will vary according to factors known in the art but is expected to be a dose of about 100 ng/kg to about 50 mg/kg, preferably about 10 g/kg to about 5 mg/kg.

Objects and advantages of this invention are further illustrated by the following examples, but the particular materials and amounts thereof recited in these examples, as well as other conditions and details, should not be construed to unduly limit this invention.

EXAMPLES Example 1 2-(4-Amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy)-1-phenylethanone

Part A

A mixture of triethyl orthoformate (92 mL, 0.55 mol) and 2,2-dimethyl-[1,3]-dioxane-4,6-dione (75.3 g, 0.522 mol) (Meldrum's acid) was heated at 55° C. for 90 minutes and then cooled to 45° C. A solution of 3-benzyloxyaniline (100.2 g, 0.5029 mol) in methanol (200 mL) was slowly added to the reaction over a period 45 minutes while maintaining the reaction temperature below 50° C. The reaction was then heated at 45° C. for one hour, allowed to cool to room temperature, and stirred overnight. The reaction mixture was cooled to 1° C., and the product was isolated by filtration and washed with cold ethanol (˜400 mL) until the filtrate was colorless. 5-{[(3-Benzyloxy)phenylimino]methyl}-2,2-dimethyl-[1,3]-dioxane-4,6-dione (170.65 g) was isolated as a tan, powdery solid.

¹H NMR (300 MHz, DMSO-d₆) δ 11.21 (d, J=14.2 Hz, 1H), 8.61 (d, J=14.2 Hz, 1H), 7.49-7.30 (m, 7H), 7.12 (dd, J=8.1, 1.96 Hz, 1H), 6.91 (dd, J=8.4, 2.1 Hz, 1H), 5.16 (s, 2H), 1.68 (s, 6H).

Part B

A mixture of 5-{[(3-benzyloxy)phenylimino]methyl}-2,2-dimethyl-[1,3]-dioxane-4,6-dione (170.65 g, 0.483 mol) and DOWTHERM A heat transfer fluid (800 mL) was heated to 100° C. and then slowly added to a flask containing DOWTHERM A heat transfer fluid (1.3 L, heated at 210° C.) over a period of 40 minutes. During the addition, the reaction temperature was not allowed to fall below 207° C. Following the addition, the reaction was stirred at 210° C. for one hour, and then allowed to cool to ambient temperature. A precipitate formed, which was isolated by filtration, washed with diethyl ether (1.7 L) and acetone (0.5 L), and dried in an oven to provide 76.5 g of 7-benzyloxyquinolin-4-ol as a tan powder.

¹H NMR (300 MHz, DMSO-d₆) δ 11.53 (s, 1H), 7.99 (dd, J=7.4, 2.4 Hz, 1H), 7.79 (d, J=7.4 Hz, 1H), 7.50-7.32 (m, 5H), 7.00 (s, 1H), 6.98 (dd, J=7.4, 2.5 Hz, 1H), 5.93 (d, J=7.5 Hz, 1H), 5.20 (s, 2H).

Part C

A mixture of 7-benzyloxyquinolin-4-ol (71.47 g, 0.2844 mol) and propionic acid (700 mL) was heated to 125° C. with vigorous stirring. Nitric acid (23.11 mL of 16 M) was slowly added over a period of 30 minutes while maintaining the reaction temperature between 121° C. and 125° C. After the addition, the reaction was stirred at 125° C. for 1 hour then allowed to cool to ambient temperature. The resulting solid was isolated by filtration, washed with water, and dried in an oven for 1.5 days to provide 69.13 g of 7-benzyloxy-3-nitroquinolin-4-ol as a grayish powder.

¹H NMR (300 MHz, DMSO-d₆) δ 12.77 (s, 1H), 9.12 (s, 1H), 8.17 (dd, J=6.3, 3.3 Hz, 1H), 7.51-7.33 (m, 5H), 7.21-7.17 (m, 2H), 5.25 (s, 2H).

Part D

N,N-Dimethylformamide (100 mL) (DMF) was cooled to 0° C., and phosphorous oxychloride (27.5 mL, 0.295 mol) was added dropwise. The resulting solution was stirred for 25 minutes and then added dropwise to a mixture of 7-benzyloxy-3-nitroquinolin-4-ol (72.87 g, 0.2459 mol) in DMF (400 mL). Following the addition, the reaction was heated at 100° C. for 5 minutes, cooled to ambient temperature, and poured into ice water with stirring. A tan precipitate formed, which was isolated by filtration and dissolved in dichloromethane. The resulting solution was dried over magnesium sulfate, filtered, and concentrated under reduced pressure to yield 72.9 g of 7-benzyloxy-4-chloro-3-nitroquinoline as a light brown solid.

¹H NMR (300 MHz, DMSO-d₆) δ 9.34 (s, 1H), 8.36 (d, J=8.7 Hz, 1H), 7.71 (d, J=2.4 Hz, 1H), 7.66 (dd, J=9.3, 2.4 Hz, 1H), 7.56-7.51 (m, 2H), 7.46-7.34 (m, 3H), 5.40 (s, 2H).

Part E

Triethylamine (38.6 mL, 0.277 mol) was added to a solution of 7-benzyloxy-4-chloro-3-nitroquinoline (72.9 g, 0.232 mol) in dichloromethane (1200 mL). Isobutylamine (25.24 mL, 0.2540 mol) was then added, and the reaction mixture was stirred for 18 hours at ambient temperature. The reaction mixture was diluted with dichloromethane, washed sequentially with water (2×) and brine, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure to yield 67.4 g of (7-benzyloxy-3-nitroquinolin-4-yl)(2-methylpropyl)amine as a brown solid.

¹H NMR (300 MHz, DMSO-d₆) δ 9.29 (t, J=4.8 Hz, 1H), 9.07 (s, 1H), 8.42 (d, J=9.4 Hz, 1H), 7.53-7.49 (m, 2H), 7.45-7.32 (m, 4H), 7.27 (dd, J=9.3, 2.6 Hz, 1H), 5.32 (s, 2H), 3.60 (t, J=6.0 Hz, 2H), 2.00 (septet, J=6.7 Hz, 1H), 0.96 (d, J=6.3 Hz, 6H).

Part F

Sodium borohydride (29.0 g, 0.767 mol) was added in small portions to a solution of nickel(II)chloride (22.8 g, 0.096 mol) in methanol (1.25 L). A solution of (7-benzyloxy-3-nitroquinolin-4-yl)(2-methylpropyl)amine (67.4 g, 0.192 mol) in methanol (300 mL) and dichloromethane (300 mL) was added to the resulting mixture. A precipitate was present and was dissolved by the addition of dichloromethane (500 mL). Additional sodium borohydride (˜10 g) was added in small portions until the (7-benzyloxy-3-nitroquinolin-4-yl)(2-methylpropyl)amine was consumed. The reaction mixture was filtered through a layer of CELITE filter aid, and the filter cake was washed with 50:50 dichloromethane:methanol. The filtrate was concentrated under reduced pressure, and the black, oily residue was treated with water and dichloromethane. The organic solution was washed with water and brine, dried over magnesium sulfate, and filtered. The filtrate was treated with activated charcoal, filtered, and concentrated under reduced pressure to yield 55.4 g of 7-benzyloxy-N⁴-(2-methylpropyl)quinoline-3,4-diamine a brown semi-solid.

¹H NMR (300 MHz, DMSO-d₆) δ 8.26 (s, 1H), 7.94 (d, J=9.4 Hz, 1H), 7.51-7.48 (m, 2H), 7.43-7.30 (m, 3H), 7.21 (d, J=3.2 Hz, 1H), 7.10 (dd, J=9.5, 2.4 Hz, 1H), 5.18 (s, 2H), 4.92 (t, J=7.0 Hz, 1H), 4.70 (s, 2H), 3.04 (t, J=6.9 Hz, 2H), 1.75 (septet, J=6.8 Hz, 1H), 0.89 (d, J=6.3 Hz, 6H).

Part G

Trimethyl orthobutyrate (29.75 mL, 0.1859 mol) was added in three portions to a solution of 7-benzyloxy-N⁴-(2-methylpropyl)quinoline-3,4-diamine (54.6 g, 0.170 mol) in toluene (795 mL). Pyridine hydrochloride (1.96 g) was then added, and the reaction was heated at 105° C. and stirred for four hours. Additional trimethyl orthobutyrate (7 mL, 40 mmol) was then added, and the reaction was stirred for three hours. The reaction was allowed to cool to ambient temperature, and the solvent was removed under reduced pressure. The oily residue was treated with chloroform, which was removed under reduced pressure to remove residual toluene, and then again diluted with chloroform (1.2 L). The resulting solution was washed sequentially with 5% aqueous sodium bicarbonate, water, and brine; dried over magnesium sulfate; filtered; and concentrated under reduced pressure to yield 60.3 g of 7-benzyloxy-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinoline as an oily brown solid, containing a small amount of toluene (0.93 equivalents).

¹H NMR (300 MHz, DMSO-d₆) δ 9.15 (s, 1H), 8.25 (d, J=8.8 Hz, 1H), 7.68 (d, J=2.6 Hz, 1H), 7.53-7.12 (m, 6H), 5.31 (s, 2H), 4.42 (d, J=7.5 Hz, 2H), 2.94 (t, J=7.5 Hz, 2H), 2.25-2.09 (m, 1H), 1.90 (sextet, J=7.4 Hz, 2H), 1.04 (t, J=7.5 Hz, 3H), 0.89 (d, J=6.3 Hz, 6H).

Part H

3-Chloroperoxybenzoic acid (60% pure, 22.9 g, 79.6 mmol) (mCPBA) was added in portions to a solution of 7-benzyloxy-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinoline (27.0 g, 72.3 mmol) in dichloromethane (1 L), and the reaction was stirred for 30 minutes. Water (1 L) was added, and the resulting mixture was stirred for 30 minutes. The organic layer was washed with 1% aqueous sodium carbonate (2×200 mL), dried over magnesium sulfate, filtered, and concentrated under reduced pressure.

Part I

The material from Part H was dissolved in dichloromethane (800 mL), and concentrated ammonium hydroxide (300 mL) was added. p-Toluenesulfonyl chloride (16.6 g, 86.8 mmol) was added in small portions to the resulting mixture, and the reaction was stirred for 30 minutes and then diluted with water. The organic layer was dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The crude product was recrystallized from acetonitrile to provide 21.4 g of 7-benzyloxy-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine as feathery, off-white crystals, mp 206.2-208.2° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.87 (d, J=9.1 Hz, 1H), 7.52-7.28 (m, 5H), 7.12 (d, J=2.4 Hz, 1H), 6.97 (dd, J=8.9, 2.8 Hz, 1H), 6.38 (s, 2H), 5.20 (s, 2H), 4.28 (d, J=6.8 Hz, 2H), 2.86 (t, J=7.5 Hz, 2H), 2.21-2.08 (m, 1H), 1.83 (sextet, J=7.3 Hz, 2H), 1.01 (t, J=7.5 Hz, 3H), 0.91 (d, J=7.0 Hz, 6H).

Part J

7-Benzyloxy-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine (21.4 g, 55.1 mmol) was dissolved in refluxing ethanol (2 L), and 10% palladium on carbon (5.4 g, 5.1 mmol) was added to the warm solution. The reaction was placed under hydrogen pressure (50 psi, 3.4×10⁵ Pa) overnight. The catalyst was removed by filtration and washed with hot ethanol (500 mL) and methanol (400 mL). The filtrate was concentrated under reduced pressure to yield 14.5 g of an off-white solid. A small portion of the solid was recrystallized from 2-propanol to provide 4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-ol as white crystals, mp>265° C.

¹H NMR (300 MHz, DMSO-d₆) δ 9.44 (br s, 1H), 7.78 (d, J=8.9 Hz, 1H), 6.95 (d, J=2.5 Hz, 1H), 6.79 (dd, J=8.9, 2.6 Hz, 1H), 6.29 (br s, 2H), 4.26 (d, J=7.4 Hz, 2H), 2.84 (t, J=7.4 Hz, 2H), 2.14 (septet, J=6.7 Hz, 1H), 1.88-1.77 (m, 2H), 1.01 (t, J=7.3 Hz, 3H), 0.91 (d, J=6.6 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 156.1, 152.3, 151.9, 146.9, 133.1, 126.5, 121.2, 111.9, 109.9, 108.4, 51.3, 28.8, 28.7, 21.0, 19.3, 13.9;

MS (APCI) m/z 299 (M+H)⁺;

Anal. Calcd. for C₁₇H₂₂N₄₀: % C, 68.43; % H, 7.43; % N, 18.78. Found: % C, 68.38; % H, 7.27; % N, 18.74.

Part K

A warm solution of 4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-ol (266 mg, 0.891 mmol) in DMF (20 mL) was cooled to approximately 0° C. Solid cesium carbonate (580 mg, 1.78 mmol) was added. After ten minutes, 2-bromoacetophenone (186 mg, 0.935 mmol) was added in one portion, and the reaction was allowed to warm to room temperature and was stirred overnight. An analysis by high-performance liquid chromatography (HPLC) indicated the presence of starting material. Additional 2-bromoacetophenone was added, and the reaction was stirred for six hours. The reaction was poured into deionized water (200-300 mL) and stirred for 15 hours. The resulting precipitate was isolated by filtration and purified by column chromatography on silica gel (eluting with chloroform:methanol ranging in ratios from 99.5:0.5 to 98:2). The product was then recrystallized from acetonitrile, isolated by filtration, and dried overnight under high vacuum to provide 222 mg of 2-(4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy)-1-phenylethanone as white crystals, mp 178.0-180.0° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.04-8.00 (m, 2H), 7.81 (d, J=9.1 Hz, 1H), 7.65-7.59 (m, 1H), 7.54-7.48 (m, 2H), 7.23 (d, J=2.7 Hz, 1H), 7.12 (dd, J=9.0, 2.7 Hz, 1H), 5.42 (s, 2H), 5.36 (br s, 2H), 4.20 (d, J=7.5 Hz, 2H), 2.86 (t, J=7.9 Hz, 2H), 2.34 (septet, J=6.8 Hz, 1H), 1.97-1.87 (m, 2H), 1.08 (t, J=7.4 Hz, 3H), 1.00 (d, J=6.7 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 193.7, 156.9, 153.1, 151.4, 146.3, 134.5, 133.8, 133.7, 128.8, 127.9, 125.7, 121.0, 113.4, 110.4, 108.5, 70.4, 52.4, 29.6, 29.0, 21.4, 19.7, 14.0;

MS (APCI) m/z 417 (M+H)⁺;

Anal. Calcd. for C₂₅H₂₈N₄O₂: % C, 72.09; % H, 6.78; % N, 13.45. Found: % C, 71.89; % H, 6.58; % N, 13.24.

Example 2 8-(2-Aminoethoxy)-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Part A

The general procedure described in Part A of Example 1 was used with the following modification. A solution of 4-benzyloxyaniline (100 g, 0.5 mol) in methanol (150 mL) was used in lieu of a solution of 3-benzyloxyaniline. The addition of this solution was carried out over a period of one hour while maintaining the temperature between 57-60° C. The reaction product, 5-{[(4-benzyloxy)phenylimino)]methyl}-2,2-dimethyl-[1,3]-dioxane-4,6-dione (136.7 g) was isolated as a yellow powder.

¹H NMR (300 MHz, DMSO-d₆) δ 11.23 (d, J=15.2 Hz, 1H), 8.46 (d, J=14.3 Hz, 1H), 7.53-7.30 (m, 7H), 7.10-7.04 (m, 2H), 5.13 (s, 2H), 1.66 (s, 6H).

Part B

A solution of 5-{[(4-benzyloxy)phenylimino)]methyl}-2,2-dimethyl-[1,3]-dioxane-4,6-dione (127.2 g, 0.360 mol) and DOWTHERM A heat transfer fluid (500 mL) was heated to 100° C. and then slowly added to a flask containing DOWTHERM A heat transfer fluid (1 L, heated at 250° C.) over a period of 90 minutes. During the addition, the reaction temperature was not allowed to fall below 245° C. Following the addition, the reaction was stirred at 250° C. for 30 minutes, and then allowed to cool to ambient temperature. A precipitate formed, which was isolated by filtration, washed with diethyl ether (1 L) and acetone (250 mL), and dried for two hours under vacuum in to provide 65.7 g of 6-benzyloxyquinolin-4-ol as a yellow powder.

¹H NMR (300 MHz, DMSO-d₆) δ 11.72 (s, 1H), 7.84 (d, J=7.3 Hz, 1H), 7.59 (m, 8H), 5.98 (d, J=7.0 Hz, 1H), 5.18 (s, 2H).

Part C

The general method described in Part C of Example 1 was followed using 6-benzyloxyquinolin-4-ol (65.7 g, 0.261 mol) in lieu of 7-benzyloxyquinolin-4-ol. The reaction precipitate was isolated by filtration; washed with propionic acid (600 mL), isopropanol (500 mL) and diethyl ether (500 mL); and dried for two days under vacuum to provide 46.01 g of 6-benzyloxy-3-nitroquinolin-4-ol as a tan powder, containing 5% 6-benzyloxyquinolin-4-ol.

¹H NMR (300 MHz, DMSO-d₆) δ 12.98 (s, 1H), 9.12 (s, 1H), 7.75 (d, J=3.3 Hz, 1H), 7.70 (d, J=8.6 Hz, 1H), 7.53-7.30 (m, 6H), 5.25 (s, 2H).

Part D

The general method described in Part D of Example 1 was used to convert 6-benzyloxy-3-nitroquinolin-4-ol (46.93 g, 158.4 mmol) to 6-benzyloxy-4-chloro-3-nitroquinoline, which was isolated as a tan solid containing some DMF.

¹H NMR (500 MHz, DMSO-d₆) δ 9.23 (s, 1H), 8.16 (d, J=9.1 Hz, 1H), 7.80 (dd, J=9.1, 2.8 Hz, 1H), 7.76 (d, J=2.7 Hz, 1H), 7.57-7.53 (m, 2H), 7.45-7.34 (m, 3H), 5.39 (s, 2H).

Part E

Triethylamine (44 mL, 0.32 mol) was added to a solution of the material from Part D in dichloromethane (790 mL). n-Propylamine (19.48 mL, 237.0 mmol) was then added over a period of 25 minutes, and the reaction was stirred for 18 hours. The reaction mixture was diluted with dichloromethane (500 mL), washed sequentially with water and brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure. The crude product was recrystallized from 2-propanol to provide 39.1 g of (6-benzyloxy-3-nitroquinolin-4-yl)propylamine as fine, yellowish-brown needles.

¹H NMR (300 MHz, DMSO-d₆) δ 8.89 (s, 1H), 8.57 (s, 1H), 7.93 (d, J=3.1 Hz, 1H), 7.85 (d, J=9.5 Hz, 1H), 7.58-7.33 (m, 6H), 5.30 (s, 2H), 3.41-3.35 (m, 2H), 1.67 (sextet, J=7.3 Hz, 2H), 0.87 (t, J=7.5 Hz, 3H).

Part F

(6-Benzyloxy-3-nitroquinolin-4-yl)propylamine (18.00 g, 53.35 mmol), 5% platinum on carbon (5.3 g), toluene (200 mL) and 2-propanol (20 mL) were added to a Parr vessel. The vessel was purged with nitrogen and then placed under hydrogen pressure (30 psi, 2.1×10⁵ Pa) and shaken for 20 minutes. The reaction mixture was filtered through a layer of CELITE filter aid, and the filter cake was washed with toluene (1 L) and 2-propanol (1 L). The orange filtrate was concentrated under reduced pressure. Heptane was added to the residue and subsequently removed under reduced pressure. The residue was dried under vacuum (0.1 torr, 13.3 Pa) for 30 minutes to provide 17.0 g of 6-benzyloxy-N⁴-propylquinoline-3,4-diamine as a viscous, brown oil containing some toluene.

¹H NMR (300 MHz, DMSO-d₆) δ 8.23 (s, 1H), 7.64 (d, J=9.4 Hz, 1H), 7.52 (d, J=1.9 Hz, 1H), 7.43-7.11 (m, 5H), 7.05 (dd, J=9.4, 2.5 Hz, 1H), 5.22 (s, 2H), 4.99 (s, 2H), 4.62 (t, J=6.7 Hz, 1H), 2.99 (q, J=7.1 Hz, 2H), 1.47 (sextet, J=7.3 Hz, 2H), 0.85 (t, J=7.2 Hz, 3H).

Part G

A solution of ethoxyacetyl chloride (6.53 g, 53.3 mmol) in dichloromethane (65 mL) was added dropwise to a solution of the material from Part F in dichloromethane (200 mL), and the reaction was stirred for 16 hours. A precipitate formed and was isolated by filtration and washed with cold hexanes. The solid was dried for 30 minutes under reduced pressure to provide 16.1 g of N-(6-benzyloxy-4-propylaminoquinolin-3-yl)-2-ethoxyacetamide hydrochloride as a tan powder.

¹H NMR (300 MHz, DMSO-d₆) δ 14.14 (s, 1H), 9.74 (s, 1H), 8.56 (s, 1H), 8.43 (s, 1H), 8.06 (d, J=2.4 Hz, 1H), 7.89 (d, J=9.2 Hz, 1H), 7.68 (dd, J=9.4, 2.6 Hz, 1H), 7.56-7.35 (m, 5H), 5.30 (s, 2H), 4.11 (s, 2H), 3.64 (q, J=7.1 Hz, 2H), 3.68-3.60 (m, 2H), 1.61 (sextet, J=7.4 Hz, 2H), 1.23 (t, J=7.2 Hz, 3H), 0.89 (t, J=7.2 Hz, 3H).

Part H

Triethylamine (22.16 mL, 159.0 mmol) was added to a solution of N-(6-benzyloxy-4-propylaminoquinolin-3-yl)-2-ethoxyacetamide hydrochloride (16.1 g) in ethanol (265 mL), and the reaction mixture was heated at reflux and stirred for 3 hours. The reaction mixture was allowed to cool to ambient temperature. The ethanol was removed under reduced pressure and the residue dissolved in chloroform. The resulting solution was washed sequentially with water and brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure. The resulting oil was dissolved in acetonitrile and concentrated under reduced pressure to yield 14.32 g of 8-benzyloxy-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinoline as a brown, crystalline solid.

¹H NMR (300 MHz, DMSO-d₆) δ 9.03 (s, 1H), 8.09 (d, J=8.7 Hz, 1H), 7.64 (d, J=2.6 Hz, 1H), 7.54-7.33 (m, 6H), 5.38 (s, 2H), 4.83 (s, 2H), 4.59 (at, J=7.8 Hz, 2H), 3.57 (q, J=7.0 Hz, 2H), 1.84 (sextet, J=7.5 Hz, 2H), 1.16 (t, J=7.3 Hz, 3H), 0.96 (t, J=7.1 Hz, 3H).

Part I

8-Benzyloxy-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinoline (15.00 g, 39.84 mmol) and ethanol (300 mL) were added to a Parr vessel. A mixture of palladium hydroxide (2.0 g, 20% on carbon) in ethanol (100 mL) was then added. The vessel was purged with nitrogen, placed under hydrogen pressure (25 psi, 1.7×10⁵), and shaken for three hours. The vessel was then refilled with hydrogen (25 psi, 1.7×10⁵) and shaken for 18 hours. The reaction mixture was filtered through a layer of CELITE filter aid, and the filter cake was washed with methanol (2 L). The filtrate was concentrated under reduced pressure, and the resulting orange oil was dissolved in toluene and concentrated under reduced pressure to provide 10.7 g of 2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol as a granular, orange solid.

¹H NMR (300 MHz, DMSO-d₆) δ 10.11 (s, 1H), 8.94 (s, 1H), 7.99 (d, J=8.7 Hz, 1H), 7.54 (d, J=2.5 Hz, 1H), 7.24 (dd, J=8.8, 2.5 Hz, 1H), 4.82 (s, 2H), 4.51 (at, J=7.7 Hz, 2H), 3.57 (q, J=7.0 Hz, 2H), 1.91 (sextet, J=7.7 Hz, 2H), 1.16 (t, J=6.7 Hz, 3H), 1.06 (t, J=7.2 Hz, 3H).

Part J

A solution of di-tert-butyl dicarbonate (36.0 g, 0.165 mol) in tetrahydrofuran (THF) (80 mL) was added dropwise to a solution of 2-aminoethanol (10.0 g, 0.164 mol) in THF (50 mL) and 10% aqueous sodium hydroxide (66 mL), and the reaction was stirred for 16 hours. A precipitate formed. The THF was removed under reduced pressure, and 15% aqueous potassium hydrogen sulfate was slowly added to adjust the resulting mixture to pH 3. The mixture was then extracted with ethyl acetate (3×), and the combined extracts were washed sequentially with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure to afford 23.6 g of tert-butyl 2-hydroxyethylcarbamate as a colorless oil containing some ethyl acetate.

Part K

Iodine (30.46 g, 0.120 mol) was added in three portions to a solution of triphenylphosphine (28.85 g, 0.110 mol) and imidazole (7.49 g, 0.110 mol) in dichloromethane (654 mL), and the reaction was stirred until the iodine dissolved. A solution of tert-butyl 2-hydroxyethylcarbamate (17.7 g, 0.110 mol) in dichloromethane (150 mL) was added over a period of 45 minutes, and the reaction was stirred for 16 hours at ambient temperature. The reaction mixture was poured into saturated aqueous sodium thiosulfate and stirred until the solution became colorless. The organic layer was washed sequentially with saturated aqueous sodium thiosulfate, water, and brine; dried over magnesium sulfate; filtered; and concentrated under reduced pressure. The resulting pale yellow oil was purified by column chromatography on silica gel (eluting with 80:20 hexanes:ethyl acetate) to provide a pale yellow oil which slowly crystallized to afford 24.6 g of tert-butyl 2-iodoethylcarbamate as a yellow solid.

Part L

Solid cesium carbonate (18.33 g, 56.22 mmol) was added to a solution of 2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol (10.7 g, 37.5 mmol), prepared in Parts A-I, in DMF (185 mL). tert-Butyl 2-iodoethylcarbamate (11.17 g, 41.2 mmol), prepared in Parts J and K, was added, and the reaction mixture was heated at 65° C. for 18 hours. The solvent was removed under reduced pressure, and the residue was partitioned between dichloromethane and water. The organic fraction was washed with water (4×100 mL) and brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure to provide a black oil. The oil was purified by column chromatography on silica gel (eluting with 98:2 dichloromethane:methanol) to yield 14.6 g of tert-butyl[2-(2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]carbamate as a tan, waxy solid.

¹H NMR (300 MHz, DMSO-d₆) δ 9.02 (s, 1H), 8.07 (d, J=9.2 Hz, 1H), 7.57 (d, J=2.5 Hz, 1H), 7.36 (dd, J=8.9, 2.8 Hz, 1H), 7.10 (t, J=5.6 Hz, 1H), 4.84 (s, 2H), 4.64 (at, J=8.1 Hz, 2H), 4.21 (t, J=6.0 Hz, 2H), 3.57 (q, J=7.0 Hz, 2H), 3.41 (q, J=5.8 Hz, 2H), 1.93 (sextet, J=7.8 Hz, 2H), 1.39 (s, 9H), 1.16 (t, J=6.8 Hz, 3H), 1.04 (t, J=7.1 Hz, 3H).

Part M

mCPBA (60% pure, 12.76 g, 44.36 mmol) was added in one portion to a solution of tert-butyl[2-(2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]carbamate (14.4 g, 33.6 mmol) and chloroform (150 mL); the reaction mixture was stirred for 30 minutes. The reaction mixture was then poured into saturated aqueous sodium carbonate (100 mL) and stirred for 30 minutes. Chloroform (250 mL) was added, and the organic fraction was washed sequentially with 5% aqueous sodium carbonate, water, and brine; dried over magnesium sulfate; filtered; and concentrated under reduced pressure. The resulting red oil was triturated with ethyl acetate to provide 9.7 g of tert-butyl 2-[(2-ethoxymethyl-5-oxido-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]ethylcarbamate as a peach-colored powder.

¹H NMR (300 MHz, DMSO-d₆) δ 8.87 (s, 1H), 8.71 (d, J=9.3 Hz, 1H), 7.56 (d, J=2.7 Hz, 1H), 7.43 (dd, J=9.5, 2.3 Hz, 1H), 7.11 (t, J=5.6 Hz, 1H), 4.81 (s, 2H), 4.62 (at, J=7.8 Hz, 2H), 4.24 (t, J=5.6 Hz, 2H), 3.58 (q, J=6.9 Hz, 2H), 3.41 (q, J=5.8 Hz, 2H), 1.92 (sextet, J=7.6 Hz, 2H), 1.39 (s, 9H), 1.17 (t, J=6.8 Hz, 3H), 1.03 (t, J=7.6 Hz, 3H).

Part N

Ammonium hydroxide (50 mL) was added to a solution of tert-butyl 2-[(2-ethoxymethyl-5-oxido-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]ethylcarbamate (9.7 g, 22 mmol) in dichloromethane (120 mL), and the mixture was cooled to 10° C. p-Toluenesulfonyl chloride (4.16 g, 21.8 mmol) was added in small portions, while maintaining the reaction temperature below 15° C. The reaction was stirred for 16 hours; a tan precipitate formed. Dichloromethane (500 mL) was added, and the precipitate was isolated by filtration and washed with diethyl ether to provide 3.98 g of tert-butyl[2-(4-amino-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]carbamate as a fine powder. The organic layer was washed sequentially with ammonium hydroxide, water, and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting solid was recrystallized from acetonitrile to provide 4.4 g of tert-butyl 2-[(4-amino-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]ethylcarbamate as a peach-colored powder.

¹H NMR (300 MHz, DMSO-d₆) δ 7.55 (d, J=8.8 Hz, 1H), 7.38 (d, J=2.6 Hz, 1H), 7.12 (dd, J=9.4, 2.5 Hz, 1H), 7.04 (t, J=5.3 Hz, 1H), 6.34 (s, 2H), 4.78 (s, 2H), 4.54 (at, J=7.9 Hz, 2H), 4.09 (t, J=5.9 Hz, 2H), 3.56 (q, J=7.1 Hz, 2H), 3.35 (q, J=5.8 Hz, 2H), 1.90 (sextet, J=7.7 Hz, 2H), 1.39 (s, 9H), 1.16 (t, J=6.9 Hz, 3H), 1.02 (t, J=7.3 Hz, 3H).

Part O

A solution of hydrogen chloride (55 mL of 1.2 M) in ethanol was added to tert-butyl 2-[(4-amino-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]ethylcarbamate (3.98 g, 8.97 mmol), and the reaction was heated at reflux for one hour. The reaction mixture was allowed to cool to ambient temperature, and the solvent was removed under reduced pressure. The resulting yellow solid was dissolved in a small volume of water, and 10% aqueous sodium hydroxide was added to adjust to pH 13. The mixture was then extracted with dichloromethane (3×100 mL), and the combined extracts were washed sequentially with water and brine, dried over magnesium sulfate, and concentrated under reduced pressure. The resulting solid was recrystallized from acetonitrile to provide 2.63 g of 8-(2-aminoethoxy)-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as fine, peach-colored needles, mp 157-159° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.55 (d, J=8.7 Hz, 1H), 7.39 (d, J=2.4 Hz, 1H), 7.14 (dd, J=9.2, 2.8 Hz, 1H), 6.32 (s, 2H), 4.77 (s, 2H), 4.55-4.50 (m, 2H), 4.04 (t, J=5.6 Hz, 2H), 3.56 (q, J=7.1 Hz, 2H), 2.94 (t, J=6.0 Hz, 2H), 1.91 (sextet, J=7.5 Hz, 2H), 1.59 (s, 2H), 1.16 (t, J=6.9 Hz, 3H), 1.04 (t, J=7.6 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 153.3, 150.5, 148.9, 140.0, 132.7, 127.6, 126.6, 117.1, 114.6, 102.3, 70.6, 65.3, 64.2, 46.8, 41.1, 23.3, 14.9, 10.8;

MS (APCI) m/z 344.2081 (344.2087 calcd for C₁₈H₂₅N₅O₂, M+H);

Anal. Calcd. for C₁₈H₂₅N₅O₂: % C, 62.95; % H, 7.34; % N, 20.39. Found: % C, 62.68; % H, 7.22; % N, 20.26.

Example 3 N-[2-(4-Amino-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]methanesulfonamide

Methanesulfonic anhydride (0.265 g, 1.52 mmol) was added in one portion to a solution of 8-(2-aminoethoxy)-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.500 g, 1.46 mmol) in dichloromethane (10 mL), and the reaction was stirred for 30 minutes. A precipitate formed. Aqueous sodium hydroxide (25 mL of 10%) was added, and the mixture was stirred for 20 minutes. The aqueous layer was separated and extracted with dichloromethane. The combined organic fractions were washed sequentially with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting white solid was purified by column chromatography on silica gel (eluting with a dichloromethane:methanol ranging in ratios from 97:3 to 94:6) and then recrystallized from acetonitrile to yield 0.302 g of N-[2-(4-amino-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]methanesulfonamide as white, granular crystals, mp 178-179.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.57 (d, J=8.8 Hz, 1H), 7.39 (d, J=3.2 Hz, 1H), 7.33 (t, J=5.8 Hz, 1H), 7.15 (dd, J=9.2, 2.8 Hz, 1H), 6.36 (s, 2H), 4.77 (s, 2H), 4.56-4.51 (m, 2H), 4.17 (t, J=5.6 Hz, 2H), 3.56 (q, J=6.9 Hz, 2H), 3.40 (q, J=5.6 Hz, 2H), 2.98 (s, 3H), 1.91 (m, 2H), 1.16 (t, J=6.9 Hz, 3H), 1.03 (t, J=7.3 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 152.7, 150.6, 148.9, 140.1, 132.7, 127.6, 126.7, 117.0, 114.6, 102.6, 67.3, 65.3, 64.2, 46.7, 41.9, 23.3, 14.9, 10.8;

MS (APCI) m/z 422.1850 (422.1862 calcd for C₁₉H₂₇N₅O₄S, M+H);

Anal. Calcd. for C₁₉H₂₇N₅O₄S: % C, 54.14; % H, 6.46; % N, 16.61; % S, 7.61. Found: % C, 54.19; % H, 6.65; % N, 16.26; % S, 7.81.

Example 4 N-(2-{[4-Amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}ethyl)morpholine-4-carboxamide

4-Morpholinecarbonyl chloride (0.177 mL, 1.52 mmol) was added dropwise to a solution of 8-(2-aminoethoxy)-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.500 g, 1.46 mmol) in dichloromethane, and the reaction was stirred for ten minutes. Triethylamine (0.418 mL, 3.00 mmol) was then added, and the reaction was stirred for 16 hours. Aqueous sodium hydroxide (50%) was added, and the mixture was stirred for 30 minutes and then diluted with dichloromethane (100 mL). The organic layer was separated, washed sequentially with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The residue was then treated with concentrated hydrochloric acid and water. A precipitate formed and was isolated by filtration, washed with water and diethyl ether, and dried in a vacuum oven at 60° C. to provide 0.180 g of N-(2-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}ethyl)morpholine-4-carboxamide hydrochloride as a white solid, mp 200-202° C. ¹H NMR (300 MHz, DMSO-d₆) δ 13.47 (s, 1H), 8.71 (bs, 2H), 7.79 (d, J=9.4 Hz, 1H), 7.54 (d, J=2.5 Hz, 1H), 7.40 (dd, J=9.3, 2.5 Hz, 1H), 6.84 (t, J=5.4 Hz, 1H), 4.84 (s, 2H), 4.65 (t, J=7.8 Hz, 2H), 4.19 (t, J=6.1 Hz, 2H), 3.59 (q, J=7.0 Hz, 2H), 3.52 (t, J=4.7 Hz, 4H), 3.50-3.40 (m, 2H), 3.26 (t, J=4.9 Hz, 4H), 1.90 (sextet, J=7.4 Hz, 2H), 1.17 (t, J=7.2 Hz, 3H), 1.03 (t, J=7.3 Hz, 3H);

MS (APCI) m/z 457.2557 (457.2563 calcd for C₂₃H₃₂N₆O₄, M+H);

Anal. Calcd. for C₂₃H₃₂N₆O₄.1.0HCl.1.0H₂O: % C, 54.06; % H, 6.90; % N, 16.45; % Cl, 6.94. Found: % C, 54.36; % H, 6.74; % N, 16.57; % Cl, 6.99.

The acidic filtrate was cooled to 0° C. and adjusted to pH 13 with the addition of 50% aqueous sodium hydroxide; the resulting opaque solution was extracted with dichloromethane. The combined extracts were washed with water and brine, dried over magnesium sulfate, and concentrated under reduced pressure. The resulting white solid was triturated with hot acetonitrile and isolated by filtration to yield 0.114 g of N-(2-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}ethyl)morpholine-4-carboxamide as a white powder, mp 203-208° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.55 (d, J=9.2 Hz, 1H), 7.41 (d, J=2.3 Hz, 1H), 7.14 (dd, J=9.2, 2.9 Hz, 1H), 6.79 (t, J=5.2 Hz, 1H), 6.33 (s, 2H), 4.77 (s, 2H), 4.57-4.52 (m, 2H), 4.12 (t, J=6.0 Hz, 2H), 3.59-3.42 (m, 7H), 3.28-3.24 (m, 5H), 1.97-1.81 (m, 2H), 1.16 (t, J=7.1 Hz, 3H), 1.02 (t, J=7.5 Hz, 3H);

Anal. Calcd. for C₂₃H₃₂N₆O₄.0.25H₂O: % C, 59.92; % H, 7.11; % N, 18.23. Found: % C, 59.99; % H, 7.10; % N, 18.15.

Example 5 N-(2-{[4-Amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}ethyl)-2-methylpropanamide hydrochloride

Isobutyryl chloride (0.160 mL, 1.53 mmol) was added dropwise to a solution of 8-(2-aminoethoxy)-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.500 g, 1.46 mmol) in dichloromethane (10 mL), and the reaction was stirred for 16 hours. A precipitate formed, and dichloromethane (10 mL) was added. The precipitate was isolated by filtration, washed with dichloromethane (20 mL) and diethyl ether (75 mL), and dried for one hour under reduced pressure to provide 0.511 g of N-(2-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}ethyl)-2-methylpropanamide hydrochloride as an off-white solid, mp 240-242° C.

¹H NMR (300 MHz, DMSO-d₆) δ 13.89 (s, 1H), 8.73 (bs, 2H), 8.06 (t, J=5.4 Hz, 1H), 7.79 (d, J=9.0 Hz, 1H), 7.51 (d, J=2.4 Hz, 1H), 7.40 (dd, J=8.9, 2.1 Hz, 1H), 4.84 (s, 2H), 4.67-4.61 (m, 2H), 4.18 (t, J=5.9 Hz, 2H), 3.59 (q, J=6.8 Hz, 2H), 3.48 (q, J=5.6 Hz, 2H), 2.41 (septet, J=6.9 Hz, 1H), 1.91 (sextet, J=7.3 Hz, 2H), 1.18 (t, J=6.8 Hz, 3H), 1.04 (t, J=7.4 Hz, 3H), 1.00 (d, J=6.9 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 176.5, 155.3, 152.1, 148.1, 134.9, 128.4, 124.7, 120.2, 119.3, 113.2, 104.2, 66.8, 65.6, 63.8, 47.1, 37.8, 33.9, 23.1, 19.5, 14.9, 10.6;

MS (APCI) m/z 414.2499 (414.2505 calcd for C₂₂H₃₁N₅O₃, M+H);

Anal. Calcd. for C₂₂H₃₁N₅O₃.1.0HCl: % C, 58.72; % H, 7.17; % N, 15.56; % Cl, 7.88. Found: % C, 58.51; % H, 7.40; % N, 15.56; % Cl, 7.88.

Example 6 N-(2-{[4-Amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}ethyl)tetrahydrofuran-2-carboxamide

A solution of 8-(2-aminoethoxy)-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.500 g, 1.46 mmol) and benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (1.282 g, 2.90 mmol) in dichloromethane (15 mL) was cooled to 0° C. A solution of tetrahydro-2-furoic acid (0.168 g, 1.45 mmol) in dichloromethane (5 mL) and triethylamine (0.811 mL, 5.82 mmol) were sequentially added. The reaction was stirred at 0° C. for 30 minutes, allowed to warm to ambient temperature, stirred for two hours, and poured into water. The aqueous layer was extracted with dichloromethane. The combined organic fractions were washed sequentially with water (2×) and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (eluting with dichloromethane:methanol ranging in ratios from 99:1 to 96:4) to provide the desired product and a bis amide by-product. The bis amide by-product was treated with 1N aqueous hydrochloric acid, heated at reflux for 1.5 hours, and cooled to 0° C. The mixture was adjusted to pH 13 with the addition of 10% aqueous sodium hydroxide and extracted with dichloromethane. The combined extracts were washed with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure to provide a yellow oil. The oil and the previously recovered amide were combined and recrystallized from acetonitrile to provide 0.220 g of N-(2-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}ethyl)tetrahydrofuran-2-carboxamide as a tan, crystalline solid, mp 202.5-204.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.96 (t, J=5.5 Hz, 1H), 7.55 (d, J=8.5 Hz, 1H), 7.39 (d, J=2.7 Hz, 1H), 7.13 (dd, J=9.3, 2.5 Hz, 1H), 6.34 (s, 2H), 4.77 (s, 2H), 4.56-4.51 (m, 2H), 4.25-4.21 (m, 1H), 4.14 (t, J=6.0 Hz, 2H), 3.91-3.84 (m, 1H), 3.79-3.72 (m, 1H), 3.56 (q, J=6.9 Hz, 2H), 3.54-3.48 (m, 2H), 2.17-2.05 (m, 1H), 1.96-1.69 (m, 5H), 1.16 (t, J=6.8 Hz, 3H), 1.02 (t, J=7.5 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 172.8, 152.9, 150.6, 148.9, 140.1, 132.7, 127.6, 126.7, 117.1, 114.6, 102.5, 77.7, 68.5, 66.2, 65.3, 64.2, 46.7, 37.7, 29.9, 24.8, 23.3, 14.9, 10.7;

MS (APCI) m/z 442.2459 (442.2454 calcd for C₂₃H₃₁N₅O₄, M+H);

Anal. Calcd. for C₂₃H₃₁N₅O₄: % C, 62.57; % H, 7.08; % N, 15.86. Found: % C, 62.47; % H, 7.14; % N, 15.91.

Example 7 tert-Butyl 3-{[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propylcarbamate

Part A

7-Benzyloxy-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinoline (60.3 g, 0.188 mol), prepared as described in Parts A-G of Example 1, and 10% palladium on carbon (10 g) were mixed with ethanol (500 mL). Ammonium formate (101.53 g, 1.61 mol) and ethanol (500 mL) were then added, and the reaction mixture was heated at reflux for two hours. The mixture was allowed to cool to ambient temperature slowly and stirred overnight. The reaction mixture was filtered through a layer of CELITE filter aid, and the filter cake was washed with ethanol (1 L), methanol (2 L) and dichloromethane (2 L). The combined filtrates were concentrated under reduced pressure to provide a tan solid, which was triturated with cold ethanol and isolated by filtration to yield 30 g of 1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-ol as a tan, granular solid.

¹H NMR (300 MHz, DMSO-d₆) δ 9.89 (s, 1H), 9.00 (s, 1H), 8.12 (d, J=9.3 Hz, 1H), 7.41 (d, J=2.5 Hz, 1H), 7.23 (dd, J=9.3, 2.5 Hz, 1H), 4.36 (d, J=7.4 Hz, 2H), 2.91 (t, J=7.5 Hz, 2H), 2.25-2.10 (m, 1H), 1.88 (sextet, J=7.4 Hz, 2H), 1.03 (t, J=7.5 Hz, 3H), 0.92 (d, J=7.1 Hz, 6H).

Part B

The general methods described in Parts J and K of Example 2 were used to prepare 16.2 g of tert-butyl 3-iodopropylcarbamate from 3-amino-1-propanol (6.55 g, 8.72 mmol); the product was isolated as a yellow solid.

Part C

A modification of the general method described in Part L of Example 2 was used to treat 1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-ol with tert-butyl 3-iodopropylcarbamate. The reaction mixture was diluted with water; a precipitate formed. The precipitate was isolated by filtration, washed with water and then with diethyl ether until the filtrate was clear, and dried overnight in a vacuum oven at 60° C. to yield tert-butyl 3-{[1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propylcarbamate as a tan powder.

¹H NMR (300 MHz, DMSO-d₆) δ 9.06 (s, 1H), 8.19 (d, J=9.3 Hz, 1H), 7.54 (d, J=2.6 Hz, 1H), 7.33 (dd, J=8.9, 2.9 Hz, 1H), 6.99-6.86 (m, 1H), 4.40 (d, J=8.0 Hz, 2H), 4.15 (t, J=6.3 Hz, 2H), 3.14 (q, J=6.4 Hz, 2H), 2.92 (t, J=7.6 Hz, 2H), 2.27-2.09 (m, 1H), 1.98-1.80 (m, 4H), 1.38 (s, 9H), 1.04 (t, J=7.2 Hz, 3H), 0.92 (d, J=6.1 Hz, 6H).

Part D

The general methods described in Parts M and N of Example 2 were used to convert tert-butyl 3-{[1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propylcarbamate to tert-butyl 3-{[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propylcarbamate, which was isolated as off-white crystals, mp 162.5-164° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.86 (d, J=8.9 Hz, 1H), 7.04 (d, J=2.6 Hz, 1H), 6.94-6.88 (m, 1H), 6.89 (dd, J=9.2, 2.8, Hz, 1H), 6.36 (s, 2H), 4.28 (d, J=7.5 Hz, 2H), 4.04 (t, J=6.2 Hz, 2H), 3.11 (q, J=6.5 Hz, 2H), 2.86 (t, J=7.5 Hz, 2H), 2.2-2.09 (m, 1H), 1.91-1.77 (m, 4H), 1.38 (s, 9H), 1.01 (t, J=7.2 Hz, 3H), 0.91 (d, J=6.2 Hz, 6H);

MS (APCI) m/z 456.2960 (456.2975 calcd for C₂₅H₃₇N₅O₃, M+H);

Anal. Calcd. for C₂₅H₃₇N₅O₃: % C, 65.91; % H, 8.19; % N, 15.37. Found: % C, 65.65; % H, 8.18; % N, 15.19.

Example 8 7-(3-Aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine

A modification of the general method described in Part O of Example 2 was used to deprotect tert-butyl 3-{[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propylcarbamate. A precipitate formed in the aqueous mixture at pH 13 and was isolated by filtration to provide 7-(3-aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine as a white solid, mp 173-174° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.85 (d, J=9.4 Hz, 1H), 7.06 (d, J=3.2 Hz, 1H), 6.89 (dd, J=8.8, 2.5 Hz, 1H), 6.35 (s, 2H), 4.28 (d, J=7.5 Hz, 2H), 4.10 (t, J=6.7 Hz, 2H), 2.86 (t, J=7.5 Hz, 2H), 2.72 (t, J=6.8 Hz, 2H), 2.2-2.08 (m, 1H), 1.90-1.77 (m, 4H), 1.6 (bs, 2H), 1.02 (t, J=7.6 Hz, 3H), 0.91 (d, J=6.8 Hz, 6H);

MS (APCI) m/z 356.2464 (356.2450 calcd for C₂₀H₂₉N₅O, M+H);

Anal. Calcd. for C₂₀H₂₉N₅O: % C, 67.58; % H, 8.22; % N, 19.70. Found: % C, 67.25; % H, 7.94; % N, 19.75.

Example 9 tert-Butyl 2-{[4-amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate

Part A

The preparation of 7-benzyloxy-N⁴-(2-methylpropyl)quinoline-3,4-diamine is described in Parts A-F of Example 1. Under a nitrogen atmosphere, triethyl orthoacetate (4.59 mL, 25.0 mmol) was added to a solution of 7-benzyloxy-N⁴-(2-methylpropyl)quinoline-3,4-diamine (8.05 g, 25.0 mmol) in xylenes (130 mL), and the resulting solution was heated at reflux (160° C.) overnight. The solvent volume was reduced to 70 mL using a Dean-Stark trap. Over a period of a few days, a precipitate formed. Diethyl ether was added, and the precipitate was isolated by filtration and washed with diethyl ether to provide 6.81 g of 7-benzyloxy-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinoline as a light-brown powder.

Part B

The method described in Part J of Example 1 was used to convert 7-benzyloxy-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinoline to 2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol, which was obtained as a solid, mp>250° C.

¹H NMR (300 MHz, DMSO-d₆) δ 9.95 (s, 1H), 8.97 (s, 1H), 8.12 (d, J=9.2 Hz, 1H), 7.42 (d, J=2.6 Hz, 1H), 7.25 (dd, J=8.9, 2.8 Hz, 1H), 4.35 (d, J=7.6 Hz, 2H), 2.61 (s, 3H), 2.19 (septet, J=6.9 Hz, 1H), 0.94 (d, J=6.7 Hz, 6H);

MS (APCI) m/z 256.2 (256.3 calcd for C₁₅H₁₇N₃₀, M+H);

Anal. Calcd. for C₁₅H₁₇N₃₀: % C, 70.56; % H, 6.71; % N, 16.46. Found: % C, 70.33; % H, 6.66; % N, 16.35.

Part C

tert-Butyl 2-iodoethylcarbamate (2.55 g, 9.41 mmol), prepared as described in Parts J and K of Example 2, was added to a mixture of 2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol (2.00 g, 7.83 mmol) and cesium carbonate (3.83 g, 11.7 mmol) in DMF (30 mL), and the reaction was heated at 60° C. for four hours. The solvent was removed under reduced pressure, and the resulting solid was triturated with water and isolated by filtration to yield 2.57 g of tert-butyl 2-{[2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate as a light-brown solid.

¹H NMR (300 MHz, DMSO-d₆) δ 9.04 (s, 1H), 8.21 (d, J=9.2 Hz, 1H), 7.55 (d, J=2.9 Hz, 1H), 7.34 (dd, J=9.1, 2.8 Hz, 1H), 7.07-7.02 (m, 1H), 4.39 (d, J=8.0 Hz, 2H), 4.14 (t, J=5.5 Hz, 2H), 3.38 (q, J=5.9 Hz, 2H), 2.63 (s, 3H), 2.28-2.11 (m, 1H), 1.39 (s, 9H), 0.94 (d, J=6.4 Hz, 6H).

Part D

The general methods described in Parts M and N of Example 2 were followed using tert-butyl 2-{[2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate as the starting material. The crude product was recrystallized from ethanol to yield 1.29 g of tert-butyl 2-{[4-amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate as a yellow-orange solid, mp 226.9-228.2° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.87 (d, J=8.8 Hz, 1H), 7.04 (d, J=2.5 Hz, 1H), 7.01 (t, J=5.9 Hz, 1H), 6.90 (dd, J=8.7, 2.5 Hz, 1H), 6.41 (s, 2H), 4.27 (d, J=7.6 Hz, 2H), 4.03 (t, J=5.9 Hz, 2H), 3.36-3.28 (m, 2H), 2.56 (s, 3H), 2.16 (m, 1H), 1.39 (s, 9H), 0.93 (d, J=6.9 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 157.0, 155.7, 151.9, 149.2, 146.5, 132.8, 125.0, 121.1, 111.4, 109.1, 108.2, 77.7, 66.1, 51.6, 28.8, 28.2, 19.2, 13.9;

MS (APCI) m/z 414.2507 (414.2505 calcd for C₂₁H₃₁N₅O₃, M+H);

Anal. Calcd. for C₂₁H₃₁N₅O₃: % C, 63.90; % H, 7.56; % N, 16.94. Found: % C, 63.74; % H, 7.41; % N, 16.80.

Example 10 7-(2-Aminoethoxy)-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine

The general method described in Part O of Example 2 was used to convert tert-butyl 2-{[4-amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate (1.29 g, 3.12 mmol) to 1.1 g of 7-(2-aminoethoxy)-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine, isolated as a white powder. The product was not recrystallized.

¹H NMR (300 MHz, DMSO-d₆) δ 7.86 (d, J=8.5 Hz, 1H), 7.05 (d, J=2.6 Hz, 1H), 6.91 (dd, J=9.4, 2.5 Hz, 1H), 6.40 (s, 2H), 4.27 (d, J=7.4 Hz, 2H), 4.00 (t, J=5.8 Hz, 2H), 2.92 (t, J=5.9 Hz, 2H), 2.56 (s, 3H), 2.23-2.09 (m, 1H), 1.94 (bs, 2H), 0.93 (d, J=7.1 Hz, 6H).

Example 11 N-{3-[4-Amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy]propyl}methanesulfonamide

Methanesulfonic anhydride (0.245 g, 1.41 mmol) was added in one portion to a suspension of 7-(3-aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.500 g, 1.41 mmol) in chloroform, and the reaction was stirred for 18 hours. Saturated aqueous sodium bicarbonate was added, and the reaction was stirred for 20 minutes. The aqueous layer was separated and extracted with chloroform. The combined organic fractions were washed with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting off-white solid was dissolved in concentrated hydrochloric acid; the solution was then cooled to 0° C. and adjusted to pH 13 with the addition of 50% aqueous sodium hydroxide. The opaque solution was extracted with dichloromethane. The extract was washed sequentially with water and brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure. The resulting solid was recrystallized from acetonitrile to yield 0.160 g of N-{3-[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy]propyl}methanesulfonamide as a flocculent, white solid, mp 166.5-168.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.86 (d, J=8.6 Hz, 1H), 7.085 (t, J=5.5 Hz, 1H), 7.06 (d, J=3.3 Hz, 1H), 6.91 (dd, J=8.7, 2.5 Hz, 1H), 6.37 (s, 2H), 4.29 (d, J=7.3 Hz, 2H), 4.11 (t, J=6.3 Hz, 2H), 3.14 (q, J=6.4 Hz, 2H), 2.90 (s, 3H), 2.86 (t, J=7.5 Hz, 2H), 2.14 (septet, J=7.0 Hz, 1H), 1.95 (quintet, J=6.6 Hz, 2H), 1.83 (sextet, J=7.3 Hz, 2H), 1.02 (t, J=7.6 Hz, 3H), 0.91 (d, J=7.1 Hz, 6H);

¹³C NMR (125 MHz, DMSO-d₆) δ 157.1, 152.6, 151.8, 146.2, 132.8, 125.1, 121.2, 111.6, 109.0, 108.0, 64.7, 51.2, 39.4, 39.2, 29.3, 28.7, 28.5, 20.9, 19.1, 13.8;

MS (APCI) m/z 434.2235 (434.2226 calcd for C₂₁H₃₁N₅O₃S, M+H);

Anal. Calcd. for C₂₁H₃₁N₅O₃S: % C, 58.18; % H, 7.21; % N, 16.15; % S, 7.40. Found: % C, 57.87; % H, 7.56; % N, 16.02; % S, 7.72.

Example 12 N-{2-[4-Amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yloxy]ethyl}methanesulfonamide

The general method described in Example 11 was used to convert 7-(3-aminopropoxy)-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine to 0.014 g of N-{2-[4-amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yloxy]ethyl}methanesulfonamide, which was obtained as a white solid.

¹H NMR (300 MHz, DMSO-d₆) δ 7.93 (d, J=9.6 Hz, 1H), 7.32 (t, J=5.6 Hz, 1H), 7.12 (d, J=2.5 Hz, 1H), 6.99 (dd, J=9.3, 2.6 Hz, 1H), 6.92 (s, 2H), 4.30 (d, J=7.6 Hz, 2H), 4.13 (t, J=5.7 Hz, 2H), 3.39 (q, J=5.6 Hz, 2H), 2.97 (s, 3H), 2.58 (s, 3H), 2.24-2.08 (m, 1H), 0.93 (d, J=6.9 Hz, 6H);

MS (APCI) m/z 392.1758 (392.1756 calcd for C₁₈H₂₅N₅O₃S, M+H).

Example 13 7-[3-(1,1-Dioxidoisothiazolidin-2-yl)propoxy]-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine

3-Chloropropanesulfonyl chloride (0.206 mL, 1.69 mmol) was added dropwise to a suspension of 7-(3-aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.500 g, 1.41 mmol) in chloroform (17 mL), and the reaction was stirred for 30 minutes. The solvent was removed under reduced pressure, and the residue was dissolved in DMF (17 mL). 1,8-Diazabicyclo[5.4.0]undec-7-ene (0.316 mL, 2.11 mmol) was then added, and the reaction was stirred for 18 hours. The reaction was poured into water, and the mixture was extracted twice with dichloromethane. The combined organic fractions were washed sequentially with water and brine, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (eluting with 97:3 dichloromethane:methanol) followed by recrystallization from acetonitrile to provide 0.237 g of 7-[3-(1,1-dioxidoisothiazolidin-2-yl)propoxy]-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine as needle-like, white crystals, mp 142-144° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.86 (d, J=9.1 Hz, 1H), 7.05 (d, J=2.6 Hz, 1H), 6.91 (dd, J=9.0, 2.6 Hz, 1H), 6.37 (s, 2H), 4.29 (d, J=7.4 Hz, 2H), 4.10 (t, J=6.2 Hz, 2H), 3.26-3.17 (m, 4H), 3.09 (t, J=7.0 Hz, 2H), 2.86 (at, J=7.5 Hz, 2H), 2.28-1.96 (m, 5H), 1.84 (sextet, J=7.5 Hz, 2H), 1.02 (t, J=7.3 Hz, 3H), 0.91 (d, J=6.6 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 157.0, 152.6, 151.9, 146.5, 132.8, 125.1, 121.2, 111.5, 109.0, 108.2, 64.8, 51.2, 46.8, 46.1, 41.3, 28.7, 28.6, 27.3, 20.9, 19.1, 18.3, 13.8;

MS (APCI) m/z 460.2391 (460.2382 calcd for C₂₃H₃₃N₅O₃S, M+H);

Anal. Calcd. for C₂₃H₃₃N₅O₃S: % C, 60.11; % H, 7.24; % N, 15.24; % S, 6.98. Found: % C, 59.52; % H, 7.23; % N, 15.16; % S, 6.80.

Example 14 N-(3-{[4-Amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)-2-(1-naphthyl)ethanesulfonamide

2-(1-Naphthyl)ethanesulfonyl chloride (0.358 g, 1.40 mmol) was added in one portion to a suspension of 7-(3-aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.500 g, 1.41 mmol) in chloroform, and the reaction was stirred for 30 minutes. Triethylamine (0.250 mL, 1.79 mmol) was then added. The reaction mixture was poured into saturated aqueous sodium carbonate. The organic layer was separated, washed with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting pale yellow oil was purified by column chromatography on silica gel (eluting with dichloromethane:methanol ranging in ratios from 99:1 to 94:6) and subsequent recrystallization from acetonitrile to yield 0.341 g of N-(3-{[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)-2-(1-naphthyl)ethanesulfonamide as white crystals, mp 164-168° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.00 (ad, J=7.9 Hz, 1H), 7.96-7.92 (m, 1H), 7.85-7.75 (m, 2H), 7.61-7.49 (m, 2H), 7.43-7.33 (m, 3H), 7.08 (d, J=2.4 Hz, 1H), 6.89 (dd, J=9.2, 2.9 Hz, 1H), 6.38 (s, 2H), 4.28 (d, J=7.6 Hz, 2H), 4.14 (t, J=6.2 Hz, 2H), 3.47-3.31 (m, 4H), 3.22 (q, J=6.4 Hz, 2H), 2.86 (t, J=7.5 Hz, 2H), 2.21-2.06 (m, 1H), 1.99 (quintet, J=6.7 Hz, 2H), 1.84 (septet, J=7.3 Hz, 2H), 1.02 (t, J=7.4 Hz, 3H), 0.91 (d, J=6.5 Hz, 6H);

MS (APCI) m/z 574.2847 (574.2852 calcd for C₃₂H₃₉N₅O₃S, M+H);

Anal. Calcd. for C₃₂H₃₉N₅O₃S: % C, 66.99; % H, 6.85; % N, 12.21. Found: % C, 66.67; % H, 6.98; % N, 12.22.

Example 15 N-{3-[4-Amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy]propyl}-2-methylpropanamide

A solution of 7-(3-aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.500 g, 1.41 mmol) in chloroform (15 mL) was cooled to 0° C. Isobutyryl chloride (0.147 mL, 1.40 mmol) was added dropwise, and the reaction was stirred for 30 minutes. The reaction was diluted with chloroform and poured into 3% aqueous sodium carbonate. The organic layer was separated, washed with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting white solid was recrystallized from acetonitrile to yield 0.450 g of N-{3-[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy]propyl}-2-methylpropanamide as feathery, white crystals, mp 179-181° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.86 (d, J=9.1 Hz, 1H), 7.80 (t, J=5.3 Hz, 1H), 7.04 (d, J=2.4 Hz, 1H), 6.89 (dd, J=8.6, 2.5 Hz, 1H), 6.36 (s, 2H), 4.28 (d, J=7.6 Hz, 2H), 4.05 (t, J=6.5 Hz, 2H), 3.22 (q, J=6.4 Hz, 2H), 2.86 (t, J=7.5 Hz, 2H), 2.34 (quintet, J=6.9 Hz, 1H), 2.20-2.08 (m, 1H), 1.93-1.77 (m, 4H), 1.02 (t, J=7.6 Hz, 3H), 1.00 (d, J=6.9 Hz, 6H), 0.91 (d, J=6.6 Hz, 6H);

MS (APCI) m/z 426.2871 (426.2869 calcd for C₂₄H₃₅N₅O₂, M+H);

Anal. Calcd. for C₂₄H₃₅N₅O₂: % C, 67.74; % H, 8.29; % N, 16.46. Found: % C, 67.93; % H, 8.14; % N, 16.49.

Example 16 N-{3-[4-Amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy]propyl}nicotinamide

Nicotinoyl chloride hydrochloride (0.23 g, 1.29 mmol) was added in one portion to a solution of 7-(3-aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.460 g, 1.29 mmol) and triethylamine (0.383 mL, 2.75 mmol) in chloroform (15 mL), and the reaction was stirred for 16 hours. The reaction mixture was poured into saturated aqueous sodium bicarbonate and stirred for 30 minutes. The aqueous layer was separated and extracted with chloroform. The combined organic fractions were washed sequentially with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting pale yellow oil was triturated with acetonitrile, which was removed under reduced pressure. The resulting solid was recrystallized from acetonitrile to yield 0.310 g of N-{3-[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy]propyl}nicotinamide as off-white, granular crystals, mp 172-174° C.

¹H NMR (300 MHz, DMSO-d₆) δ 9.15 (d, J=2.5 Hz, 1H), 8.77 (t, J=5.7 Hz, 1H), 8.70 (dd, J=5.0, 1.3 Hz, 1H), 8.19 (dt, J=8.1, 1.7 Hz, 1H), 7.86 (d, J=8.9 Hz, 1H), 7.52-7.47 (m, 1H), 7.07 (d, J=2.6 Hz, 1H), 6.91 (dd, J=8.9, 2.8 Hz, 1H), 6.37 (s, 2H), 4.29 (d, J=7.6 Hz, 2H), 4.14 (t, J=5.9 Hz, 2H), 3.49 (q, J=6.1 Hz, 2H), 2.86 (t, J=7.8 Hz, 2H), 2.21-1.95 (m, 3H), 1.84 (sextet, J=7.4 Hz, 2H), 1.02 (t, J=7.6 Hz, 3H), 0.91 (d, J=6.1 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 164.8, 157.1, 152.5, 151.9, 151.7, 148.3, 146.5, 134.9, 132.8, 130.0, 125.1, 123.4, 121.2, 111.5, 109.0, 108.2, 65.2, 51.2, 36.4, 28.7, 28.5, 20.9, 19.1, 13.8;

MS (APCI) m/z 461.2655 (461.2665 calcd for C₂₆H₃₂N₆O₂, M+H);

Anal. Calcd. for C₂₆H₃₂N₆O₂.0.5H₂O: % C, 66.50; % H, 7.08; % N, 17.90. Found: % C, 66.62; % H, 7.18; % N, 18.08.

Example 17 N-{2-[4-Amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yloxy]ethyl}-2-methylpropanamide

The method described in Example 15 was used to convert 7-(2-aminoethoxy)-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine to 0.170 g of N-{2-[4-amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yloxy]ethyl}-2-methylpropanamide, which was isolated as flocculent, white crystals, mp 205-206° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.00 (t, J=5.2 Hz, 1H), 7.88 (d, J=9.1 Hz, 1H), 7.07 (d, J=3.0 Hz, 1H), 6.89 (dd, J=8.9, 2.8 Hz, 1H), 6.50 (s, 2H), 4.27 (d, J=7.5 Hz, 2H), 4.06 (t, J=5.7 Hz, 2H), 3.45 (q, J=5.6 Hz, 2H), 2.56 (s, 3H), 2.39 (m, 1H), 2.16 (septet, J=6.7 Hz, 1H), 1.00 (d, J=6.9 Hz, 6H), 0.93 (d, J=6.3 Hz, 6H);

MS (APCI) m/z 456.2960 (456.2975 calcd for C₂₁H₂₉N₅O₂, M+H);

Anal. Calcd. for C₂₁H₂₉N₅O₂: % C, 65.77; % H, 7.62; % N, 18.26. Found: % C, 65.42; % H, 7.88; % N, 17.96.

Example 18 1-{2-[4-Amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy]ethyl}pyrrolidin-2-one

Part A

A mixture of 1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-ol (0.500 g, 1.76 mmol), triphenylphosphine (0.462 g, 1.76 mmol), and 1-(2-hydroxyethyl)pyrrolidin-2-one (0.200 mL, 1.77 mmol) in THF (17 mL) was cooled to 0° C. Diethyl azodicarboxylate (0.277 mL) was added dropwise, and the reaction mixture was allowed to warm to ambient temperature and stirred for 19 hours. Solid unreacted 1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-ol (0.150 g, 0.42 mmol) was removed by filtration, and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (eluting with 98:2 dichloromethane:methanol) to provide 0.456 g of 1-{2-[1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy]ethyl}pyrrolidin-2-one an off-white, waxy solid.

¹H NMR (300 MHz, DMSO-d₆) δ 9.08 (s, 1H), 8.20 (d, J=9.2 Hz, 1H), 7.58 (d, J=2.4 Hz, 1H), 7.35 (dd, J=9.2, 2.6 Hz, 1H), 4.40 (d, J=7.4 Hz, 2H), 4.27 (t, J=5.7 Hz, 2H), 3.63 (t, J=5.7 Hz, 2H), 3.50 (at, J=7.1 Hz, 2H), 2.92 (t, J=7.6 Hz, 2H), 2.30-2.10 (m, 3H), 1.98-1.83 (m, 4H), 1.04 (t, J=7.5 Hz, 3H), 0.92 (d, J=6.2 Hz, 6H).

Part B

The general methods described in Parts M and N of Example 2 were used to convert the material from Part A to 0.120 g of 1-{2-[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy]ethyl}pyrrolidin-2-one, which was obtained as tan, granular crystals, mp 206-208° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.87 (d, J=8.6 Hz, 1H), 7.07 (d, J=2.3 Hz, 1H), 6.91 (dd, J=9.2, 2.9 Hz, 1H), 6.41 (s, 2H), 4.29 (d, J=7.5 Hz, 2H), 4.16 (t, J=5.5 Hz, 2H), 3.59 (t, J=5.7 Hz, 2H), 3.48 (t, J=7.2 Hz, 2H), 2.86 (t, J=7.5 Hz, 2H), 2.23 (t, J=8.0 Hz, 2H), 2.20-2.07 (m, 1H), 1.92 (quintet, J=7.2 Hz, 2H), 1.84 (sextet, J=7.1 Hz, 2H), 1.02 (t, J=7.0 Hz, 3H), 0.91 (d, J=6.8 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 174.1, 156.8, 152.6, 152.0, 146.4, 132.7, 125.1, 121.3, 111.5, 109.2, 108.2, 65.4, 51.2, 47.3, 41.4, 30.3, 28.7, 28.5, 20.9, 19.1, 17.6, 13.8;

MS (APCI) m/z 410.2541 (410.2556 calcd for C₂₃H₃₁N₅O₂, M+H);

Anal. Calcd. for C₂₃H₃₁N₅O₂: % C, 67.46; % H, 7.63; % N, 17.10. Found: % C, 67.28; % H, 7.53; % N, 17.16.

Example 19 N-(2-{[4-Amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)morpholine-4-carboxamide

A suspension of 7-(2-aminoethoxy)-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine (0.300 g, 0.958 mmol) in chloroform (10 mL) was cooled to 0° C. 4-Morpholinecarbonyl chloride (0.110 mL, 0.942 mmol) was added dropwise, and the reaction was stirred for five minutes at 0° C. The reaction was then allowed to warm to ambient temperature over a period of 15 minutes, and the solvent was removed under reduced pressure. The resulting off-white solid was dissolved in dichloromethane. The solution was washed sequentially with 10% aqueous sodium hydroxide, water, and brine; dried over magnesium sulfate; filtered; and concentrated under reduced pressure. The residue was recrystallized from acetonitrile to provide 0.150 g of N-(2-{[4-amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)morpholine-4-carboxamide as a white powder, mp 215-219° C. (decomposition).

¹H NMR (300 MHz, DMSO-d₆) δ 7.86 (d, J=8.7 Hz, 1H), 7.06 (d, J=2.6 Hz, 1H), 6.91 (dd, J=9.1, 2.7 Hz, 1H), 6.77 (t, J=5.3 Hz, 1H), 6.42 (s, 2H), 4.27 (d, J=7.5 Hz, 2H), 4.07 (t, J=5.8 Hz, 2H), 3.53 (t, J=5.0 Hz, 4H), 3.44 (q, J=5.8 Hz, 2H), 3.27 (t, J=5.1 Hz, 4H), 2.56 (s, 3H), 2.16 (m, 1H), 0.93 (d, J=6.3 Hz, 6H);

MS (APCI) m/z 427.2475 (427.2458 calcd for C₂₂H₃₀N₆O₃, M+H);

Anal. Calcd. for C₂₂H₃₀N₆O₃: % C, 61.95; % H, 7.09; % N, 19.70. Found: % C, 61.96; % H, 7.18; % N, 19.37.

Example 20 N-(3-{[4-Amino-2-propyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)morpholine-4-carboxamide

The general method described in Example 19 was used to convert 7-(3-aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine to N-(3-{[4-amino-2-propyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)morpholine-4-carboxamide, which was isolated as a white solid, mp 145° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.86 (d, J=9.5 Hz, 1H), 7.05 (d, J=2.7 Hz, 1H), 6.89 (dd, J=8.6, 2.4 Hz, 1H), 6.61 (t, J=5.2 Hz, 1H), 6.36 (s, 2H), 4.28 (d, J=7.7 Hz, 2H), 4.06 (t, J=6.2 Hz, 2H), 3.53 (t, J=4.8 Hz, 4H), 3.28-3.18 (m, 6H), 2.86 (t, J=7.5 Hz, 2H), 2.21-2.04 (m, 1H), 1.97-1.76 (m, 4H), 1.02 (t, J=7.0 Hz, 3H), 0.91 (d, J=6.8 Hz, 6H);

MS (APCI) m/z 469.2937 (469.2927 calcd for C₂₅H₃₆N₆O₃, M+H);

Anal. Calcd. for C₂₅H₃₆N₆O₃.H₂O: % C, 61.71; % H, 7.87; % N, 17.27. Found: % C, 61.36; % H, 7.96; % N, 17.55.

Example 21 N-{[(3-{[4-Amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)amino]carbonyl}-4-fluorobenzenesulfonamide

A solution of 7-(3-aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.500 g, 1.41 mmol) in chloroform (15 mL) was cooled to 0° C.; 4-fluorobenzenesulfonyl isocyanate (0.548 g, 2.72 mmol) was added in three portions over a period of 30 minutes. A white precipitate was present and was isolated by filtration, washed with chloroform, and dried overnight in a vacuum oven at 60° C. to provide 0.671 g of N-{[(3-{[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)amino]carbonyl}-4-fluorobenzenesulfonamide as a white powder, mp 194-198° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.98-7.85 (m, 3H), 7.37 (t, J=8.7 Hz, 2H), 7.07 (d, J=2.5 Hz, 1H), 6.92 (dd, J=8.7, 2.5 Hz, 1H), 6.76 (s, 2H), 6.57 (s, 1H), 4.30 (d, J=7.6 Hz, 2H), 3.99 (t, J=6.3 Hz, 2H), 3.14 (aq, J=6.2 Hz, 2H), 2.87 (t, J=7.5 Hz, 2H), 2.22-2.05 (m, 1H), 1.91-1.77 (m, 4H), 1.02 (t, J=7.3 Hz, 3H), 0.92 (d, J=6.2 Hz, 6H);

MS (APCI) m/z 557.2365 (557.2346 calcd for C₂₇H₃₃FN₆O₄S, M+H);

Anal. Calcd. for C₂₇H₃₃FN₆O₄S: % C, 58.26; % H, 5.98; % N, 15.10; % S, 5.76; % F, 3.41.

Found: % C, 57.96; % H, 5.96; % N, 15.04; % S, 5.47; % F, 3.59.

Example 22 tert-Butyl 4-(2-{[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)piperidine-1-carboxylate

Part A

The general methods described in Parts J and K of Example 2 were used to prepare tert-butyl 4-(2-iodoethyl)piperidine-1-carboxylate, which was isolated as a yellow oil.

Part B

The general method described in Part L of Example 2 was used to treat 1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-ol with tert-butyl 4-(2-iodoethyl)piperidine-1-carboxylate. After the work-up procedure, tert-butyl 4-(2-{[1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)piperidine-1-carboxylate was isolated as a gray-brown solid and used without purification.

¹H NMR (300 MHz, DMSO-d₆) δ 9.06 (s, 1H), 8.18 (d, J=9.4 Hz, 1H), 7.56 (d, J=2.5 Hz, 1H), 7.33 (dd, J=9.0, 2.9 Hz, 1H), 4.39 (d, J=7.4 Hz, 2H), 4.19 (t, J=6.2 Hz, 2H), 3.99-3.86 (m, 3H), 2.92 (t, J=7.2 Hz, 2H), 2.81-2.62 (m, 2H), 2.25-2.06 (m, 1H), 1.89 (sextet, J=7.4 Hz, 2H), 1.80-1.64 (m, 4H), 1.39 (s, 9H), 1.20-1.00 (m, 2H), 1.04 (t, J=7.6 Hz, 3H), 0.92 (d, J=6.3 Hz, 6H).

Part C

The general methods described in Parts M and N of Example 2 were used to aminate tert-butyl 4-(2-{[1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)piperidine-1-carboxylate. The crude product was triturated with hot acetonitrile and isolated by filtration to yield tert-butyl 4-(2-{[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)piperidine-1-carboxylate as an orange solid, mp 196.4-199.6° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.84 (d, J=9.4 Hz, 1H), 7.05 (d, J=2.6 Hz, 1H), 6.89 (dd, J=8.9, 2.6 Hz, 1H), 6.38 (s, 2H), 4.28 (d, J=7.5 Hz, 2H), 4.09 (t, J=5.6 Hz, 2H), 3.98-3.88 (m, 2H), 2.86 (t, J=7.8 Hz, 2H), 2.80-2.63 (m, 2H), 2.18-2.08 (m, 1H), 1.83 (sextet, J=7.4 Hz, 2H), 1.76-1.63 (m, 5H), 1.39 (s, 9H), 1.15-1.01 (m, 2H), 1.01 (t, J=7.6 Hz, 3H), 0.91 (d, J=6.3 Hz, 6H);

MS (APCI) m/z 510.3424 (510.3444 calcd for C₂₉H₄₃N₅O₃, M+H);

Anal. Calcd. for C₂₉H₄₃N₅O₃: % C, 68.34; % H, 8.50; % N, 13.74. Found: % C, 68.05; % H, 8.67; % N, 13.54.

Example 23 1-(2-Methylpropyl)-7-(2-piperidin-4-ylethoxy)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine

The general method described in Part O of Example 2 was used to convert tert-butyl 4-(2-{[4-amino-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)piperidine-1-carboxylate to 1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine, which was isolated as a brown solid.

¹H NMR (300 MHz, DMSO-d₆) δ 7.85 (d, J=9.3 Hz, 1H), 7.04 (d, J=3.0 Hz, 1H), 6.89 (dd, J=9.1, 2.8 Hz, 1H), 6.35 (s, 2H), 4.28 (d, J=6.9 Hz, 2H), 4.08 (t, J=6.5 Hz, 2H), 2.97-2.88 (m, 2H), 2.86 (t, J=7.4 Hz, 2H), 2.50-2.37 (m, 2H), 2.21-2.07 (m, 1H), 1.83 (sextet, J=7.4 Hz, 2H), 1.70-1.50 (m, 6H), 1.18-0.97 (m, 2H), 1.02 (t, J=7.5 Hz, 3H), 0.91 (d, J=6.2 Hz, 6H);

MS (APCI) m/z 410.2918 (410.2920 calcd for C₂₄H₃₅N₅O, M+H).

Example 24 2-Methyl-1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine

Part A

The general method described in Part L of Example 2 was used to treat 2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol with tert-butyl 4-(2-iodoethyl)piperidine-1-carboxylate. After chromatographic purification, tert-butyl 4-(2-{[2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)piperidine-1-carboxylate was isolated as a viscous, orange oil.

¹H NMR (300 MHz, DMSO-d₆) δ 9.03 (s, 1H), 8.19 (d, J=9.0 Hz, 1H), 7.56 (d, J=2.1 Hz, 1H), 7.34 (dd, J=9.2, 2.6 Hz, 1H), 4.38 (d, J=7.5 Hz, 2H), 4.19 (t, J=6.3 Hz, 2H), 3.99-3.88 (m, 2H), 2.82-2.62 (m, 2H), 2.63 (s, 3H), 2.19 (septet, J=6.9 Hz, 1H), 1.81-1.61 (m, 5H), 1.39 (s, 9H), 1.18-0.99 (m, 2H), 0.93 (d, J=6.9 Hz, 6H).

Part B

The general methods described in Parts M and N of Example 2 were used to aminate tert-butyl 4-(2-{[2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)piperidine-1-carboxylate (3.6 g, 9.8 mmol). The crude product was triturated with hot acetonitrile and isolated by filtration to yield 2.67 g of tert-butyl 4-(2-{[4-amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)piperidine-1-carboxylate as a white solid.

¹H NMR (300 MHz, DMSO-d₆) δ 7.85 (d, J=9.3 Hz, 1H), 7.05 (d, J=2.7 Hz, 1H), 6.89 (dd, J=8.6, 2.6 Hz, 1H), 6.39 (s, 2H), 4.27 (d, J=7.5 Hz, 2H), 4.09 (t, J=6.0 Hz, 2H), 3.99-3.87 (m, 2H), 2.81-2.63 (m, 2H), 2.56 (s, 3H), 2.24-2.08 (m, 1H), 1.80-1.60 (m, 5H), 1.39 (s, 9H), 1.18-0.98 (m, 2H), 0.93 (d, J=6.6 Hz, 6H).

Part C

The general method described in Part O of Example 2 was used to convert the material from Part B to 1.93 g of 2-methyl-1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine, which was isolated as a tan solid.

¹H NMR (300 MHz, DMSO-d₆) δ 7.85 (d, J=8.7 Hz, 1H), 7.04 (d, J=1.8 Hz, 1H), 6.89 (d, J=8.7 Hz, 1H), 6.40 (s, 2H), 4.26 (d, J=6.9 Hz, 2H), 4.08 (t, J=5.4 Hz, 2H), 3.41-3.12 (m, 2H), 3.02-2.86 (m, 2H), 2.56 (s, 3H), 2.24-2.07 (m, 1H), 1.76-1.48 (m, 5H), 1.28-1.00 (m, 3H), 0.93 (d, J=6.3 Hz, 6H).

Example 25 7-{2-[1-(Methanesulfonyl)piperidin-4-yl]ethoxy}-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine

The general method described in Example 11 was used to convert 2-methyl-1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine to 0.150 g of 7-{2-[1-(methanesulfonyl)piperidin-4-yl]ethoxy}-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine, which was isolated as an off-white powder.

¹H NMR (300 MHz, DMSO-d₆) δ 7.85 (d, J=9.3 Hz, 1H), 7.06 (d, J=2.5 Hz, 1H), 6.90 (dd, J=8.5, 2.5 Hz, 1H), 6.39 (s, 2H), 4.27 (d, J=6.8 Hz, 2H), 4.11 (t, J=6.3 Hz, 2H), 3.59-3.49 (m, 2H), 2.84 (s, 3H), 2.70 (ddd, J=11.9, 11.9, 1.4 Hz, 2H), 2.56 (s, 3H), 2.23-2.09 (m, 1H), 1.90-1.55 (m, 5H), 1.35-1.17 (m, 2H), 0.93 (d, J=7.2 Hz, 6H).

Example 26 1-(4-{2-[4-Amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yloxy]ethyl}piperidin-1-yl)-2-methylpropan-1-one

The general method described in Example 15 was used to convert 2-methyl-1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine to 0.158 g of 1-(4-{2-[4-amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yloxy]ethyl}piperidin-1-yl)-2-methylpropan-1-one, which was isolated as an off-white solid, mp 205.1-207.1° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.85 (d, J=9.3 Hz, 1H), 7.05 (d, J=2.5 Hz, 1H), 6.90 (dd, J=8.6, 2.5 Hz, 1H), 6.40 (s, 2H), 4.39 (ad, J=11.7 Hz, 1H), 4.27 (d, J=7.5 Hz, 2H), 4.10 (t, J=6.3 Hz, 2H), 3.93 (ad, J=13.3 Hz, 1H), 3.00 (at, J=12.4 Hz, 1H), 2.85 (septet, J=6.7 Hz, 1H), 2.56 (s, 3H), 2.6-2.5 (m, 1H), 2.19 (m, 1H), 1.87-1.65 (m, 5H), 1.28-0.98 (m, 8H), 0.93 (d, J=7.0 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 173.9, 157.2, 151.9, 149.2, 146.5, 132.8, 124.9, 121.1, 111.5, 108.9, 108.1, 65.0, 51.6, 44.9, 41.2, 35.0, 32.7, 31.6, 28.9, 28.7, 19.5, 19.4, 19.2, 13.9;

MS (APCI) m/z 452.3037 (452.3026 calcd for C₂₆H₃₇N₅O₂, M+H);

Anal. Calcd. for C₂₆H₃₇N₅O₂.0.1H₂O: % C, 68.87; % H, 8.27; % N, 15.45. Found: % C, 68.37; % H, 8.33; % N, 15.07.

Example 27 7-{2-[1-(Cyclopentylcarbonyl)piperidin-4-yl]ethoxy}-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine

The general method described in Example 15 was used to treat 2-methyl-1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine with cyclopentanecarbonyl chloride to provide 0.158 g of 7-{2-[1-(cyclopentylcarbonyl)piperidin-4-yl]ethoxy}-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine, which was isolated as an off-white solid, mp 235.7-238.1° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.85 (d, J=9.1 Hz, 1H), 7.05 (d, J=1.7 Hz, 1H), 6.90 (dd, J=8.8, 2.5 Hz, 1H), 6.40 (s, 2H), 4.44-4.32 (m, 1H), 4.26 (d, J=6.6 Hz, 2H), 4.12-4.08 (m, 2H), 4.0-3.92 (m, 1H), 3.04-2.90 (m, 2H), 2.56 (s, 3H), 2.52-2.48 (m, 1H), 2.24-2.1 (m, 1H), 1.84-1.42 (m, 13H), 1.20-0.96 (m, 2H), 0.93 (d, J=7.2 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 173.0, 157.1, 151.9, 149.2, 146.5, 132.8, 124.9, 121.1, 111.5, 108.9, 108.1, 65.0, 51.6, 45.0, 41.4, 35.0, 32.7, 32.5, 31.6, 29.7, 28.7, 25.6, 19.2, 13.9;

MS (APCI) m/z 478.3189 (478.3182 calcd for C₂₈H₃₉N₅O₂, M+H);

Anal. Calcd. for C₂₈H₃₉N₅O₂.0.45H₂O: % C, 69.23; % H, 8.28; % N, 14.42. Found: % C, 68.67; % H, 8.44; % N, 14.21.

Example 28 2-Methyl-1-(2-methylpropyl)-7-{2-[1-(morpholin-4-ylcarbonyl)piperidin-4-yl]ethoxy}-1H-imidazo[4,5-c]quinolin-4-amine

A modification of the method described in Example 19 was used to convert 2-methyl-1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine to 0.195 g of 2-methyl-1-(2-methylpropyl)-7-{2-[1-(morpholin-4-ylcarbonyl)piperidin-4-yl]ethoxy}-1H-imidazo[4,5-c]quinolin-4-amine, which was isolated an off-white powder, mp 205-208° C. The product was not recrystallized.

¹H NMR (300 MHz, DMSO-d₆) δ 7.85 (d, J=9.2 Hz, 1H), 7.05 (d, J=3.1 Hz, 1H), 6.90 (dd, J=8.8, 2.5 Hz, 1H), 6.45 (s, 2H), 4.27 (d, J=7.4 Hz, 2H), 4.10 (t, J=5.5 Hz, 2H), 3.64-3.52 (m, 6H), 3.10 (at, J=4.6 Hz, 4H), 2.73 (at, J=11.9 Hz, 2H), 2.56 (s, 3H), 2.21-2.12 (m, 1H), 1.77-1.65 (m, 5H), 1.23-1.09 (m, 2H), 0.93 (d, J=6.6 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 163.2, 157.2, 151.8, 149.3, 146.3, 132.9, 124.9, 121.2, 111.6, 108.9, 107.9, 65.9, 65.0, 51.7, 47.1, 46.4, 35.2, 32.7, 31.3, 28.8, 19.3, 14.0;

MS (APCI) m/z 495.3080 (495.3084 calcd for C₂₇H₃₈N₆O₃, M+H);

Anal. Calcd. for C₂₇H₃₈N₆O₃: % C, 65.56; % H, 7.74; % N, 16.99. Found: % C, 65.21; % H, 7.40; % N, 16.68.

Example 29 4-(2-{[4-Amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)-N-cyclohexylpiperidine-1-carboxamide

A solution of 2-methyl-1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine (0.300 g, 0.786 mmol) in chloroform was cooled to 0° C. Cyclohexyl isocyanate (0.100 mL, 0.783 mmol) was added dropwise, and the reaction was stirred for 30 minutes. The solvent was removed under reduced pressure, and the residue was purified by column chromatography on silica gel (eluting with dichloromethane:methanol ranging in ratios from 99:1 to 95:5). The resulting product was recrystallized from ethanol to provide 0.130 g of 4-(2-{[4-amino-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)-N-cyclohexylpiperidine-1-carboxamide as a white powder, mp 213.7-215.7° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.85 (d, J=9.5 Hz, 1H), 7.05 (d, J=3.0 Hz, 1H), 6.89 (dd, J=8.6, 2.5 Hz, 1H), 6.43 (s, 2H), 6.06 (d, J=7.6 Hz, 1H), 4.27 (d, J=7.5 Hz, 2H), 4.09 (t, J=6.0 Hz, 2H), 4.0-3.92 (m, 2H), 3.44-3.3 (m, 1H), 2.60 (t, J=11.5 Hz, 2H), 2.56 (s, 3H), 2.16 (m, 1H), 1.77-1.50 (m, 100H), 1.3-0.96 (m, 7H), 0.93 (d, J=6.3 Hz, 6H);

MS (APCI) m/z 507.3465 (507.3448 calcd for C₂₉H₄₂N₆O₂, M+H);

Anal. Calcd. for C₂₉H₄₂N₆O₂.0.5H₂O: % C, 67.54; % H, 8.40; % N, 16.30. Found: % C, 67.78; % H, 8.43; % N, 16.46.

Example 30 2-Ethyl-1-(2-methylpropyl)-7-(2-morpholin-4-yl-2-oxoethoxy)-1H-imidazo[4,5-c]quinolin-4-amine

Part A

The general method described in Part A of Example 9 was followed. Triethyl orthopropionate (7.66 mL, 58.1 mmol) was added in lieu of triethyl orthoacetate to a solution of 7-benzyloxy-N⁴-(2-methylpropyl)quinoline-3,4-diamine (18.68 g, 58.11 mmol) in xylenes (200 mL). At the end of the reaction, the precipitate was collected in three crops to provide 7.16 g of 7-benzyloxy-2-ethyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinoline as a light-brown solid, mp 127° C.

Anal. Calcd. for C₂₃H₂₅N₃₀: % C, 76.85; % H, 7.01; % N, 11.69. Found: % C, 76.86; % H, 7.10; % N, 11.77.

Part B

The general method described in Part J of Example 1 was followed using 7-benzyloxy-2-ethyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinoline (3.43 g, 9.54 mmol) in lieu of 7-benzyloxy-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine. The crude product was recrystallized from acetonitrile, isolated by filtration, and dried for two days in an oven at 60° C. to provide 0.92 g of 2-ethyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol as an off-white solid, mp>250° C.

Anal. Calcd. for C₁₆H₁₉N₃₀: % C, 71.35; % H, 7.11; % N, 15.60. Found: % C, 71.36; % H, 7.02; % N, 15.60.

Part C

A solution of bromoacetyl bromide (3.0 mL, 0.034 mol) in dichloromethane (240 mL) was cooled to −25° C. A solution of morpholine (9.0 mL, 0.10 mol) in dichloromethane (20 mL) was slowly added over a period of one hour. After the addition was complete, the reaction was stirred at −25° C. for 15 minutes and allowed to warm to ambient temperature. Dichloromethane was added, and the resulting solution was washed with water, 1N aqueous hydrogen chloride, and brine; dried over magnesium sulfate; filtered; and concentrated under reduced pressure to provide 4-(2-bromoacetyl)morpholine as a colorless oil.

Part D

Under a nitrogen atmosphere, a mixture of 2-ethyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol (1.97 g, 7.31 mmol), solid cesium carbonate (4.77 g, 14.6 mmol), and DMF (105 mL) was heated at 85° C. for 30 minutes. The heat was removed, and a solution of 4-(2-bromoacetyl)morpholine (1.83 g, 8.77 mmol) in DMF (20 mL) was added over a period of 12 minutes. The reaction was heated at 85° C. for 3.5 hours, and methanol (1 mL) was then added. The reaction mixture was filtered to remove solids, and the filtrate was concentrated under reduced pressure to provide an orange oil. The oil was triturated with ethyl acetate and water to provide a fluffy, white solid that was isolated by filtration. The filtrate was concentrated under reduced pressure to provide a solid that was stirred with diethyl ether and water and isolated by filtration. The two solids were combined and dried in a vacuum oven at 60° C. to provide 2.75 g of 2-ethyl-1-(2-methylpropyl)-7-(2-morpholin-4-yl-2-oxoethoxy)-1H-imidazo[4,5-c]quinoline as a yellow semi-solid.

Part E

Over a period of 30 minutes, mCPBA (1.85 g, 5.47 mmol, 50% pure) was added in four portions to a solution of 2-ethyl-1-(2-methylpropyl)-7-(2-morpholin-4-yl-2-oxoethoxy)-1H-imidazo[4,5-c]quinoline (2.13 g, 5.47 mmol) in chloroform (200 mL). The reaction was stirred overnight at ambient temperature, washed twice with 1% aqueous sodium carbonate, and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (eluting with 95:5 dichloromethane:methanol) to provide 0.53 g of 2-ethyl-1-(2-methylpropyl)-7-(2-morpholin-4-yl-2-oxoethoxy)-5-oxido-1H-imidazo[4,5-c]quinoline.

Part F

Ammonium hydroxide (0.5 mL) was added to a solution of 2-ethyl-1-(2-methylpropyl)-7-(2-morpholin-4-yl-2-oxoethoxy)-5-oxido-1H-imidazo[4,5-c]quinoline (0.53 g, 1.28 mmol) in dichloromethane (3 mL), and the mixture was cooled to 0° C. p-Toluenesulfonyl chloride (0.29 g, 1.5 mmol) was added in small portions over a period of 20 minutes. The reaction was stirred at ambient temperature overnight. The reaction mixture was partitioned between dichloromethane and 1% aqueous sodium carbonate. The organic fraction was washed with 1% aqueous sodium carbonate (2×30 mL), dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The crude product was recrystallized from ethyl acetate, isolated by filtration, washed with cold hexanes, and dried under high vacuum at 55° C. to provide 0.391 g of 2-ethyl-1-(2-methylpropyl)-7-(2-morpholin-4-yl-2-oxoethoxy)-1H-imidazo[4,5-c]quinolin-4-amine as off-white needles, mp 219-220° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.87 (d, J=9.0 Hz, 1H), 7.05 (d, J=2.4 Hz, 1H), 6.94 (dd, J=9.0, 2.7 Hz, 1H), 6.4 (br s, 2H), 4.9 (s, 2H), 4.28 (d, J=7.2 Hz, 2H), 4.9-4.28 (m, 8H), 2.91 (q, J=7.5 Hz, 2H), 2.15 (septet, J=6.7 Hz, 1H), 1.36 (t, J=7.5 Hz, 3H), 0.91 (d, J=6.6 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 166.5, 156.9, 154.1, 152.3, 146.7, 133.2, 125.5, 121.5, 111.8, 109.7, 108.9, 66.4, 66.3, 51.5, 45.2, 42.0, 29.1, 20.5, 19.5, 12.4;

MS (ESI) m/z 412.2344 (412.2349 calcd. for C₂₂H₂₉N₅O₃, M+H);

Anal. Calcd. for C₂₂H₂₉N₅O₃: % C, 64.21; % H, 7.10; % N, 17.02. Found: % C, 64.07; % H, 7.21; % N, 16.99.

Example 31 2-Butyl-1-methyl-8-[(5-morpholin-4-yl-5-oxopentyl)oxy]-1H-imidazo[4,5-c]quinolin-4-amine trifluoroacetate

Part A

Methylamine (available as a 40% solution in water, 24 mL, 0.28 mol) was added to a solution of 6-benzyloxy-4-chloro-3-nitroquinoline (15.0 g, 48.5 mmol), prepared as described in Parts A-D of Example 2, in distilled water (300 mL), and the reaction was stirred at 100° C. for 1.5 hours. The reaction was allowed to cool to ambient temperature and stirred for four hours. A precipitate formed, which was isolated by filtration and washed with distilled water (3×60 mL). The solid was combined with material from another run and recrystallized from 2-propanol. The crystals were isolated by filtration, washed twice with cold hexanes, and dried for three days under high vacuum to provide 24.10 g of (6-benzyloxy-3-nitroquinolin-4-yl)methylamine as yellow crystals.

Part B

A warm solution (37° C.) of (6-benzyloxy-3-nitroquinolin-4-yl)methylamine (23.98 g, 77.6 mmol) in toluene (1.5 L) was added to a Parr vessel containing 5% platinum on carbon (11.78 g, 0.0604 mol) and a small volume of toluene. The vessel was placed under hydrogen pressure (35 psi, 2.4×10⁵ Pa) for 2.5 hours. The catalyst was removed by filtration, and the filtrate was concentrated under reduced pressure at 55° C. to provide 15.57 g of 6-benzyloxy-N⁴-methylquinoline-3,4-diamine as a brown oil.

Part C

Under a nitrogen atmosphere, trimethyl orthovalerate (18.51 mL, 0.107 mol) was added dropwise to a solution of 6-benzyloxy-N⁴-methylquinoline-3,4-diamine (15.57 g, 0.0537 mol) in xylenes (150 mL), and the reaction was heated at reflux temperature overnight. The reaction was not complete as evidenced by thin layer chromatography (TLC), and additional trimethyl orthovalerate (9.25 mL, 0.0537 mol) was added. The reaction was heated at reflux overnight, and a Dean-Stark trap was used to collect the volatiles. The reaction was then heated at 170° C. for 4.5 hours, and about 100 mL of solvent were removed by distillation. The reaction mixture was allowed to cool to ambient temperature; a precipitate formed over a period of three days. The mixture was diluted with hexanes, and the precipitate was isolated by filtration and washed with hexanes to provide 15.64 g of 8-benzyloxy-2-butyl-1-methyl-1H-imidazo[4,5-c]quinoline.

Part D

A modification of the general method described in Part J of Example 1 was followed using 8-benzyloxy-2-butyl-1-methyl-1H-imidazo[4,5-c]quinoline (14.65 g, 42.4 mmol) in lieu of 7-benzyloxy-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine. The reaction was placed under hydrogen pressure for 3.5 hours. The catalyst was removed by filtration and washed with ethyl acetate. The filtrate was concentrated under reduced pressure to a small volume, and hexanes were added. A precipitate formed, and the mixture was stored overnight in a refrigerator. The solid was isolated by filtration, washed with hexanes (500 mL), and dried for three days under high vacuum to provide 9.40 g of 2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-ol as a white solid, mp 219-220.2° C.

¹H NMR (300 MHz, DMSO-d₆) δ 9.99 (s, 1H), 8.89 (s, 1H), 7.97 (d, J=9.0 Hz, 1H), 7.73 (d, J=2.5 Hz, 1H), 7.21 (dd, J=9.0, 2.7 Hz, 1H), 4.13 (s, 3H), 2.94 (t, J=7.6 Hz, 2H), 1.79 (quintet, J=7.6 Hz, 2H), 1.44 (sextet, J=7.4 Hz, 2H), 0.95 (t, J=7.3 Hz, 3H).

MS (APCI) m/e 256.2 (256.3 calcd for C₁₅H₁₇N₃₀, M+H);

Anal. Calcd. for C₁₅H₁₇N₃₀: % C, 70.56; % H, 6.71; % N, 16.46. Found: % C, 70.60; % H, 6.65; % N, 16.38.

Part E

Under a nitrogen atmosphere, 5-bromovaleryl chloride (4.0 mL, 30 mmol) was added dropwise to a solution of morpholine (3.13 mL, 36 mmol) and triethylamine (6.25 mL, 45 mmol) in anhydrous THF (200 mL), and the reaction was stirred for 3.5 hours. Water (100 mL) was added, and the resulting solution was extracted with ethyl acetate (250 mL+150 mL). The combined extracts were washed with aqueous hydrogen chloride (100 mL of 1 N), water (60 mL), and brine (100 mL); dried over magnesium sulfate; filtered; concentrated under reduced pressure; and further dried under high vacuum to provide 6.60 g of 4-(5-bromopentanoyl)morpholine as a yellow oil.

Part F

A modification of the general method described in Part D of Example 30 was followed using 2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-ol (1.2 g, 4.7 mmol) in lieu of 2-ethyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol and 4-(5-bromopentanoyl)morpholine (3.7 mmol) in lieu of 4-(2-bromoacetyl)morpholine. After the reaction was heated overnight, an analysis by TLC indicated the presence of starting material. Additional 4-(5-bromopentanoyl)morpholine (2.2 g) and cesium carbonate (0.5 g) were added, and the reaction was heated at 80° C. overnight. After the solution was concentrated, the residue was further dried under high vacuum overnight and then dissolved in ethyl acetate. The resulting solution was washed with water and concentrated under reduced pressure. The solid was purified by column chromatography on silica gel (eluting with 90:10 dichloromethane:methanol) to provide an oil, which was stirred with diethyl ether and allowed to stand over three days in a refrigerator. A precipitate formed, which was isolated by filtration to provide 0.770 g of 2-butyl-1-methyl-8-[(5-morpholin-4-yl-5-oxopentyl)oxy]-1H-imidazo[4,5-c]quinoline as pale yellow crystals.

Part G

The general method described in Part E of Example 30 was used to convert 2-butyl-1-methyl-8-[(5-morpholin-4-yl-5-oxopentyl)oxy]-1H-imidazo[4,5-c]quinoline (0.770 g, 1.81 mmol) to 2-butyl-1-methyl-8-[(5-morpholin-4-yl-5-oxopentyl)oxy]-5-oxido-1H-imidazo[4,5-c]quinoline, obtained as mixture with starting material.

Part H

Under a nitrogen atmosphere, trichloroacetyl isocyanate (0.357 mL, 2.99 mmol) was added dropwise to a solution of the material from Part G in anhydrous dichloromethane (25 mL), and the reaction was stirred for six hours at ambient temperature. The reaction was incomplete as evidenced by a TLC analysis. Additional trichloroacetyl isocyante (0.10 mL) was added, and the reaction was stirred for 1.5 hours. Ammonium hydroxide (four drops of 7% by weight in methanol) was added, and the volatiles were removed under reduced pressure. The resulting orange solid was purified by column chromatography on silica gel (eluting with 90:10 dichloromethane:methanol) and further purified by preparative high-performance liquid chromatography (prep HPLC) with fraction collection by UV triggering. The prep HPLC fractions were analyzed using a Micromass Platform LC/MS, and the appropriate fractions were centrifuge evaporated. The prep HPLC separation was done by reversed phase chromatography with a Phenomenex Luna C18(2) column (10×50 mm, 5 micron particle size) at a flow rate of 16 mL/min. The mobile phase was a gradient mixture of water and acetonitrile (0.05% trifluoroacetic acid in each) from 5 to 95% acetonitrile in 6.5 minutes. The resulting solid was dried under vacuum for several days to provide 2-butyl-1-methyl-8-[(5-morpholin-4-yl-5-oxopentyl)oxy]-1H-imidazo[4,5-c]quinoline trifluoroacetate as a beige powder, mp 155.5-156.2° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.67 (br s, 2H), 7.76 (d, J=9.3 Hz, 1H), 7.71 (d, J=2.7 Hz, 1H), 7.38 (dd, J=9.3, 2.4 Hz, 1H), 4.2-4.15 (m, 5H), 3.6-3.52 (m, 4H), 3.5-3.4 (m, 4H), 3.0 (t, J=7.8 Hz, 2H), 2.41 (t, J=7.2 Hz, 2H), 1.85-1.62 (m, 6H), 1.44 (sextet, J=7.2 Hz, 2H), 0.96 (t, J=7.5 Hz, 3H),

¹³C NMR (150 MHz, DMSO-d₆) δ 171.5, 157.3, 156.2, 148.7, 136.1, 128.8, 125.0, 120.4, 119.2, 114.6, 105.1, 68.7, 67.0, 46.2, 43.6, 42.2, 34.3, 32.5, 29.9, 29.1, 27.1, 22.6, 22.2, 14.5; MS (ESI) m/z 440.2676 (Calcd. for C₂₄H₃₃N₅O₃ 440.2662, M+H);

Anal. Calcd. for C₂₄H₃₃N₅O₃.1.5C₂HF₃O₂.0.62H₂O: % C, 52.11; % H, 5.80; % N, 11.25; % F, 13.74. Found: % C, 51.93; % H, 5.61; % N, 11.31; % F, 12.45.

Examples 32-36 Part A

The general methods described in Parts C-E of Example 30 were followed. According to the method of Part C the amine listed in the table below was used to prepare the bromo reagent listed in the table below. According to the method of Part D, 2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-ol was treated with the bromo reagent, and the product was oxidized according to the method of Part E. For Example 35, the crude product isolated after Part D was recrystallized from water. Chromatographic purification as described in Part E was carried out only for Example 36; the remaining N-oxides were used without purification.

Part B

Under a nitrogen atmosphere, trichloroacetyl isocyanate (1.5 equivalents) was added dropwise to a solution of the material from Part A in anhydrous dichloromethane, and the reaction was stirred for between two and five hours. The solvent was removed under reduced pressure. The residue was diluted with methanol, and a solution of sodium methoxide (5 equivalents, 25% in methanol) was slowly added. The reaction was stirred overnight, and a precipitate formed. The precipitate was isolated by filtration, washed with three times with cold hexanes. The purification and characterization of the final compounds are described for each example below the table.

Example Amine Bromo Reagent R 32 Morpholine 4-(2-Bromoacetyl) morpholine

33 Piperidine 2-Bromo-1-piperidin-1- ylethanone

34 Benzylmethylamine N-Benzyl-2-bromo-N- methylacetamide

35 Diethylamine N,N-Diethyl-2- bromoacetamide

36 Bis(methoxyethylamine) 2-Bromo-N,N-bis-(2- methoxyethyl)acetamide

Example 32 2-Butyl-1-methyl-8-(2-morpholin-4-yl-2-oxoethoxy)-1H-imidazo[4,5-c]quinolin-4-amine

The crude product was recrystallized from methyl acetate to provide 2-butyl-1-methyl-8-(2-morpholin-4-yl-2-oxoethoxy)-1H-imidazo[4,5-c]quinolin-4-amine as a white solid, mp 256.8-257.2° C.

¹H NMR (500 MHz, DMSO-d₆) δ 7.61 (d, J=3.0 Hz, 1H), 7.54 (d, J=9.0 Hz, 1H), 7.12 (dd, J=9.0, 2.5 Hz, 1H), 6.24-6.19 (br s, 2H), 4.94 (s, 2H), 4.10 (s, 3H), 3.65-3.45 (m, 8H), 2.93 (t, J=7.5 Hz, 2H), 1.75 (pentet, J=7.5 Hz, 2H), 1.43 (sextet, J=7.5 Hz, 2H), 0.95 (t, J=7.5 Hz, 3H);

MS (APCI) m/z 398 (M+H)⁺,

Anal. Calcd. for C₂₁H₂₇N₅O₃: % C, 63.46; % H, 6.85; % N, 17.62. Found: % C, 63.39; % H, 6.86; % N, 17.75.

Example 33 2-Butyl-1-methyl-8-(2-oxo-2-piperidin-1-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine

The crude product was recrystallized from methyl acetate and dried for four hours in a vacuum oven at 45° C. to provide 2-butyl-1-methyl-8-(2-oxo-2-piperidin-1-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine as a white solid, mp 222.5-223.4° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.61 (d, J=2.7 Hz, 1H), 7.53 (d, J=9.0 Hz, 1H), 7.11 (dd, J=9.0, 2.7 Hz, 1H), 6.23 (br s, 2H), 4.89 (s, 2H), 4.1 (s, 3H), 3.46 (br s, 4H), 2.92 (t, J=8.1 Hz, 2H), 1.75 (pentet, J=7.5 Hz, 2H), 1.59-1.36 (m, 8H), 0.95 (t, J=7.2 Hz, 3H);

MS (EI) m/z 395.2327 (Calcd. for C₂₂H₂₉N₅O₂ 395.2321);

Anal. Calcd. for C₂₆H₂₉N₅O₂: % C, 66.81; % H, 7.39; % N, 17.71. Found: % C, 66.81; % H, 7.18; % N, 17.63.

Example 34 2-[(4-Amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]-N-benzyl-N-methylacetamide

The crude product was recrystallized from a mixture of DMF and water to provide 2-[(4-amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]-N-benzyl-N-methylacetamide as an off-white solid, mp 167.4-168.8° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.64 (d, J=2.7 Hz, 1H), 7.55 (d, J=9.0 Hz, 1H), 7.21 (br s, 5H), 7.10 (d, J=8.1 Hz, 1H), 5.89 (br s, 2H), 4.94 (s, 2H), 4.57 (br s, 2H), 4.03 (s, 3H), 3.01 (s, 3H), 2.91 (t, J=7.2 Hz, 2H), 1.78 (pentet, J=7.5 Hz, 2H), 1.45 (sextet, J=7.2 Hz, 2H), 0.95 (t, J=7.5 Hz, 3H);

MS (APCI) m/z 432 (M+H)⁺,

Anal. Calcd. for C₂₅H₂₉N₅O₂: % C, 69.58; % H, 6.77; % N, 16.23. Found: % C, 69.35; % H, 6.47; % N, 16.13.

Example 35 2-[(4-Amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]-N,N-diethylacetamide

The crude product was purified by column chromatography on silica gel (eluting with 95:5 dichloromethane:methanol). The pure fractions were concentrated under reduced pressure to a small volume, and hexanes were added. A precipitate formed and was washed with hexanes to provide 2-[(4-amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]-N,N-diethylacetamide as a white solid, mp 185.90-188.10° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.61 (d, J=2.6 Hz, 1H), 7.54 (d, J=9.1 Hz, 1H), 6.37 (dd, J=9.1, 2.7 Hz, 1H), 6.19 (s, 2H), 4.88 (s, 2H), 4.09 (s, 3H), 3.41 (m, 2H), 2.92 (t, J=7.6 Hz, 2H), 1.75 (m, 2H), 1.43 (m, 2H), 1.17 (t, J=7.0 Hz, 3H), 1.06 (t, J=7.0 Hz, 3H), 0.95 (t, J=7.3 Hz, 3H);

MS (EI) m/z 383.2326 (Calcd. for C₂₁H₂₉N₅O₂ 383.2321);

Anal. Calcd. for C₂₁H₂₉N₅O₂.0.15H₂O: % C, 65.31; % H, 7.65; % N, 18.13. Found: % C, 65.18; % H, 7.28; % N, 18.11.

Example 36 2-[(4-Amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]-N,N-bis(2-methoxyethyl)acetamide

The product from the reaction with sodium methoxide did not precipitate from the reaction solution. The solvent was removed under reduced pressure, and the residue was recrystallized from 2-propanol, isolated by filtration, washed with hexanes, stirred with water for two hours, isolated by filtration, and washed with water. The solid was then recrystallized twice from methanol, purified by column chromatography on silica gel (eluting with 95:5 dichloromethane:methanol), and recrystallized from dimethyl sulfoxide to provide 2-[(4-amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]-N,N-bis(2-methoxyethyl)acetamide as a peach-colored, crystalline solid, mp 125-128° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.57 (d, J=3.0 Hz, 1H), 7.53 (d, J=9.3 Hz, 1H), 7.08 (dd, J=9.3, 3.0 Hz, 1H), 6.17 (s, 2H), 4.95 (s, 2H), 4.09 (s, 3H), 3.61 (t, J=4.8 Hz, 2H), 3.53 (t, J=4.8 Hz, 2H), 3.49 (t, J=5.1 Hz, 2H), 3.41 (t, J=4.8 Hz, 2H), 3.41 (s, 6H), 2.93 (t, J=7.2 Hz, 2H), 1.75 (pentet, J=7.8 Hz, 2H), 1.43 (sextet, J=7.8 Hz, 2H), 0.94 (t, J=7.8 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 167.6, 152.8, 152.0, 149.8, 139.2, 132.5, 126.7, 126.0, 115.7, 114.7, 102.5, 69.8, 69.2, 66.0, 57.9, 57.5, 46.5, 44.6, 32.4, 29.0, 25.8, 21.4, 13.3;

MS (EI) m/z 443.2529 (443.2533 calcd. for C₂₃H₃₃N₅O₄).

Example 37 tert-Butyl 4-[2-(4-amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]piperidine-1-carboxylate

Part A

The method described in Part L of Example 2 was used to treat 2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-ol with tert-butyl 4-(2-iodoethyl)piperidine-1-carboxylate. Following chromatographic purification, tert-butyl 4-[2-(4-amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]piperidine-1-carboxylate was isolated as a viscous, pale yellow oil containing some DMF.

¹H NMR (300 MHz, DMSO-d₆) δ 8.95 (s, 1H), 8.03 (d, J=9.6 Hz, 1H), 7.74 (d, J=3.0 Hz, 1H), 7.29 (dd, J=9.2, 2.6 Hz, 1H), 4.51-4.42 (m, 1H), 4.19 (s, 3H), 4.16 (t, J=7.2 Hz, 2H), 3.95-3.84 (m, 1H), 2.98 (t, J=5.4 Hz, 2H), 2.29-2.16 (m, 1H), 2.03-1.87 (m, 1H), 1.80 (quintet, J=7.7 Hz, 2H), 1.70-1.37 (m, 9H), 1.29 (s, 9H), 0.95 (t, J=7.7 Hz, 3H).

Part B

The methods described in Parts M and N of Example 2 were used to convert tert-butyl 4-[2-(4-amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]piperidine-1-carboxylate to tert-butyl 4-[2-(4-amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]piperidine-1-carboxylate, which was obtained as an off-white powder, mp 171.1-173.2° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.56 (d, J=3.1 Hz, 1H), 7.53 (d, J=8.6 Hz, 1H), 7.06 (dd, J=9.3, 2.9 Hz, 1H), 6.19 (s, 2H), 4.49-4.40 (m, 1H), 4.10 (s, 3H), 4.04 (t, J=6.0 Hz, 2H), 3.94-3.81 (m, 1H), 2.92 (t, J=7.9 Hz, 2H), 2.9-2.75 (m, 1H), 2.24-2.1 (m, 1H), 1.96-1.84 (m, 1H), 1.75 (quintet, J=7.7 Hz, 2H), 1.68-1.50 (m, 5H), 1.43 (sextet, J=7.5 Hz, 2H), 1.31 (s, 9H), 1.31-1.2 (m, 1H), 0.95 (t, J=7.2 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 154.0, 153.1, 152.9, 150.1, 139.5, 133.0, 127.3, 126.5, 116.2, 115.3, 102.2, 78.3, 65.2, 47.4, 32.9, 29.5, 29.1, 28.4, 28.0, 26.2, 25.3, 21.9, 18.6, 13.7; MS (APCI) m/z 482.3111 (482.3131 calcd for C₂₇H₃₉N₅O₃, M+H);

Anal. Calcd. for C₂₇H₃₉N₅O₃: % C, 67.33; % H, 8.16; % N, 14.54. Found: % C, 67.37; % H, 8.22; % N, 14.48.

Example 38 2-Butyl-1-methyl-8-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine

A modification of the method described in Part O of Example 2 was used to deprotect tert-butyl 4-[2-(4-amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]piperidine-1-carboxylate. The crude product was triturated with diethyl ether and isolated by filtration to provide 2-butyl-1-methyl-8-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine as a yellow powder, mp 210-212° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.58 (d, J=2.6 Hz, 1H), 7.52 (d, J=9.4 Hz, 1H), 7.08 (dd, J=9.2, 2.8 Hz, 1H), 6.16 (s, 2H), 4.16 (at, J=6.2 Hz, 2H), 4.12 (s, 3H), 2.96-2.87 (m, 1H), 2.92 (at, J=7.9 Hz, 2H), 2.68-2.56 (m, 1H), 2.56-2.43 (m, 1H), 2.12-1.96 (m, 1H), 1.75 (quintet, J=7.0 Hz, 2H), 1.69-1.60 (m, 4H), 1.51-1.24 (m, 5H), 1.03-0.97 (m, 1H), 0.95 (t, J=7.6 Hz, 3H);

MS (APCI) m/z 382.2621 (382.2607 calcd for C₂₂H₃₁N₅O, M+H);

Anal. Calcd. for C₂₂H₃₁N₅O: % C, 69.26; % H, 8.19; % N, 18.36. Found: % C, 68.87; % H, 8.13; % N, 18.12.

Example 39 1-{4-[2-(4-Amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]piperidin-1-yl}-2-methylpropan-1-one

A modification of the method described in Example 15 was followed. The reaction solvent was 1-methylpyrrolidin-2-one, and 2-butyl-1-methyl-8-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine was used as the starting material. Following recrystallization from acetonitrile, 1-{4-[2-(4-amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]piperidin-1-yl}-2-methylpropan-1-one was isolated as yellow needles, mp 189.4-192.6° C.

MS (APCI) m/z 452.3031 (452.3026 calcd for C₂₆H₃₇N₅O₂, M+H);

Anal. Calcd. for C₂₆H₃₇N₅O₂.0.60H₂O: % C, 67.53; % H, 8.33; % N, 15.14. Found: % C, 67.59; % H, 8.23; % N, 15.39.

Example 40 2-Butyl-8-{2-[1-(cyclopentylcarbonyl)piperidin-4-yl]ethoxy}-1-methyl-1H-imidazo[4,5-c]quinolin-4-amine

A modification of the method described in Example 15 was used to treat 2-butyl-1-methyl-8-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine with cyclopentanecarbonyl chloride. The crude product was purified by column chromatography on silica gel to provide 2-butyl-8-{2-[1-(cyclopentylcarbonyl)piperidin-4-yl]ethoxy}-1-methyl-1H-imidazo[4,5-c]quinolin-4-amine as a white solid, mp 147.2-150.1° C.

MS (APCI) m/z 478.3173 (478.3182 calcd for C₂₈H₃₉N₅O₂, M+H);

Anal. Calcd. for C₂₈H₃₉N₅O₂.0.45H₂O: % C, 69.23; % H, 8.28; % N, 14.42. Found: % C, 68.91; % H, 8.20; % N, 14.31.

Example 41 2-Butyl-8-{2-[1-(methanesulfonyl)piperidin-4-yl]ethoxy}-1-methyl-1H-imidazo[4,5-c]quinolin-4-amine

A suspension of 2-butyl-1-methyl-8-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine (0.320 g, 0.839 mmol) and methanesulfonic anhydride (0.153, 0.878 mmol) in dichloromethane (20 mL) was stirred for five minutes. Triethylamine (0.122 mL, 0.875 mmol) was added dropwise, and the solution was stirred for 1.5 hours. The reaction was poured into water, and the organic layer was separated and stirred with 10% aqueous sodium hydroxide for 20 minutes. The organic layer was separated and washed with brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting solid was recrystallized from acetonitrile to yield 0.174 g of 2-butyl-8-{2-[1-(methanesulfonyl)piperidin-4-yl]ethoxy}-1-methyl-1H-imidazo[4,5-c]quinolin-4-amine as a feathery, white solid, mp 198-199.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.60 (d, J=2.7 Hz, 1H), 7.53 (d, J=9.1 Hz, 1H), 7.09 (dd, J=9.1, 2.7 Hz, 1H), 6.16 (s, 2H), 4.20-4.16 (m, 3H), 4.10 (s, 3H), 3.65-3.56 (m, 1H), 3.11-3.01 (m, 1H), 2.98-2.90 (m, 2H), 2.93 (s, 3H), 2.28-2.16 (m, 1H), 1.98 (sextet, J=6.8 Hz, 1H), 1.80-1.36 (m, 10H), 0.95 (t, J=7.3 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 153.1, 152.8, 150.1, 139.5, 133.0, 127.3, 126.4, 116.4, 115.3, 102.7, 65.4, 49.3, 32.9, 29.5, 28.9, 27.8, 26.2, 24.7, 21.8, 18.2, 13.7;

MS (APCI) m/z 460.2396 (460.2382 calcd for C₂₃H₃₃N₅O₃S, M+H);

Anal. Calcd. for C₂₃H₃₃N₅O₃S: % C, 60.11; % H, 7.24; % N, 15.24; % S, 6.98. Found: % C, 59.95; % H, 7.21; % N, 15.30; % S, 6.92.

Example 42 2-Butyl-1-methyl-8-{2-[1-(morpholin-4-ylcarbonyl)piperidin-4-yl]ethoxy}-1H-imidazo[4,5-c]quinolin-4-amine

A modification of the method described in Example 19 was followed. The reaction solvent was 1-methylpyrrolidin-2-one, and 2-butyl-1-methyl-8-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine was used as the starting material. The reaction mixture was poured into water, and a precipitate formed. The precipitate was isolated by filtration, washed with water, and dried for two days in a vacuum oven at 70° C. to provide 0.320 g of 2-butyl-1-methyl-8-{2-[1-(morpholin-4-ylcarbonyl)piperidin-4-yl]ethoxy}-1H-imidazo[4,5-c]quinolin-4-amine as a white solid, mp 152.8° C. (decomposition).

¹H NMR (300 MHz, DMSO-d₆) δ 7.56 (d, J=3.2 Hz, 1H), 7.53 (d, J=9.3 Hz, 1H), 7.06 (dd, J=9.2, 2.8 Hz, 1H), 6.17 (s, 2H), 4.19-3.96 (m, 3H), 4.11 (s, 3H), 3.54-3.34 (m, 5H), 3.14-2.90 (m, 7H), 2.26-2.09 (m, 1H), 2.04-1.89 (m, 1H), 1.75 (quintet, J=7.5 Hz, 2H), 1.68-1.51 (m, 5H), 1.43 (sextet, J=7.4 Hz, 2H), 1.46-1.28 (m, 1H), 0.95 (t, J=7.5 Hz, 3H);

MS (APCI) m/z 495.3080 (495.3084 calcd for C₂₇H₃₈N₆O₃, M+H);

Anal. Calcd. for C₂₇H₃₈N₆O₃: % C, 65.56; % H, 7.74; % N, 16.99. Found: % C, 65.33; % H, 7.88; % N, 16.95.

Example 43 N-[2-(4-Amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]propanamide

Part A

A mixture of 2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-ol (0.51 g, 2.0 mmol), prepared as described in Parts A-D of Example 31, and 2-ethyl-2-oxazoline (0.5 g, 5 mmol) were heated at 150° C. for four hours. Additional 2-ethyl-2-oxazoline (2 mL, 2 mmol) was added, and the heating was continued for a total of four days. The reaction was dissolved in dichloromethane, and the resulting solution was washed with aqueous potassium hydroxide (20 mL of 4 N), dried over magnesium sulfate, and concentrated under reduced pressure. The crude product was recrystallized from methyl acetate (20 mL) to provide 0.20 g of N-{2-[2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]ethyl}propanamide.

Part B

The general method described in Part E of Example 30 was used to convert N-{2-[2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]ethyl}propanamide (0.18 g, 0.51 mmol) to 0.14 g of N-{2-[2-butyl-1-methyl-5-oxido-1H-imidazo[4,5-c]quinolin-8-yl)oxy]ethyl}propanamide. The reaction was complete in two hours.

Part C

Ammonium hydroxide (5 mL) and p-toluenesulfonyl chloride (0.072 g, 0.38 mmol) were added with rapid stirring to a solution of N-{2-[2-butyl-1-methyl-5-oxido-1H-imidazo[4,5-c]quinolin-8-yl)oxy]ethyl}propanamide (0.14 g, 0.38 mmol) in dichloromethane (15 mL), and the mixture was stirred at ambient temperature for one hour. A precipitate formed and was isolated by filtration, washed with water, and dried under reduced pressure to provide N-[2-(4-amino-2-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]propanamide as a solid, mp 250-255° C. (decomposition).

Example 44 2-[(4-Amino-1,2-dimethyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]acetic acid

Part A

7-Benzyloxy-1,2-dimethyl-1H-imidazo[4,5-c]quinoline was prepared according to the methods described in Parts A-C of Example 31. In Part C, triethyl orthoformate was used in lieu of trimethyl orthovalerate. A solution of 7-benzyloxy-1,2-dimethyl-1H-imidazo[4,5-c]quinoline in ethanol was added to a Parr vessel with 10% palladium on carbon. The reaction was placed under hydrogen pressure (35 psi, 2.4×10⁵ Pa) for 20 hours. The reaction mixture was then filtered through a layer of CELITE filter aid, and the filtrate was concentrated under reduced pressure. The residue was dissolved in acetic acid with heating, and the hot solution was filtered and concentrated under reduced pressure. The resulting beige solid was dissolved in 1 N aqueous hydrochloric acid, and deactivated carbon was added. The solution was heated, filtered, and treated with 50% aqueous sodium hydroxide. A precipitate formed and was isolated by filtration to provide 1,2-dimethyl-1H-imidazo[4,5-c]quinolin-8-ol as a solid, mp>300° C.

Part B

Sodium hydride (0.61 g, 15 mmol, available as a 60% dispersion in mineral oil) was added to a solution of 1,2-dimethyl-1H-imidazo[4,5-c]quinolin-8-ol (2.5 g, 12 mmol) in DMF. The reaction mixture was stirred for 30 minutes, and ethyl bromoacetate (1.96 g, 11.7 mmol) was added. The stirring was continued for five hours, and a small volume of ethanol was added. The volatiles were removed under reduced pressure, and the residue was dissolved in dichloromethane. The resulting solution was washed three times with deionized water, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting yellow solid was recrystallized from ethyl acetate to provide 1.65 g of ethyl 2-[(1,2-dimethyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]acetate as a white solid.

Part C

Ethyl 2-[(1,2-dimethyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]acetate (1.6 g, 5.35 mmol) was added to a solution of potassium hydroxide (0.90 g, 0.16 mol) in a 50:50 mixture of methanol:water (30 mL). The solution was stirred under a nitrogen atmosphere until it was complete as evidenced by HPLC analysis. The methanol was removed under reduced pressure, and 6 N aqueous hydrochloric acid was added until the solution exhibited a neutral pH. A precipitate formed and was isolated by filtration to provide 1.25 g of 2-[(1,2-dimethyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]acetic acid as a white solid, mp 290° C. (decomposition).

Part D

Morpholine (0.39 g, 4.4 mmol) and 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (0.85 g, 4.4 mmol) were added to a solution of 2-[(1,2-dimethyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]acetic acid (1.20 g, 4.42 mmol) in pyridine, and the reaction was stirred for four days under a nitrogen atmosphere. The solvent was removed under reduced pressure, and the residue was stirred with heptane, which was then removed under reduced pressure. The resulting orange solid was purified by column chromatography on silica gel (eluting with 90:10 dichloromethane:methanol) to provide 2-[(1,2-dimethyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]-1-morpholin-1-ylethanone as a pale yellow solid.

Part E

The general method described in Part E of Example 30 was followed using 2-[(1,2-dimethyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]-1-morpholin-1-ylethanone (0.97 g, 2.85 mmol) as the starting material. The reaction was complete in two hours. The product was soluble in aqueous sodium carbonate; therefore, the aqueous washings were concentrated under reduced pressure. 2-Propanol was added to the residue with heating, and the mixture was filtered. The filtrate was concentrated under reduced pressure to provide 0.14 g of 2-[(1,2-dimethyl-5-oxido-1H-imidazo[4,5-c]quinolin-8-yl)oxy]-1-morpholin-1-ylethanone.

Part F

Ammonium hydroxide (30 mL) and p-toluenesulfonyl chloride (0.46 g, 2.4 mmol) were added with rapid stirring to a solution of 2-[(1,2-dimethyl-5-oxido-1H-imidazo[4,5-c]quinolin-8-yl)oxy]-1-morpholin-1-ylethanone (0.86 g, 2.4 mmol) in dichloromethane, and the mixture was stirred at ambient temperature for two days. The volatiles were removed under reduced pressure, and the residue was recrystallized from 2-propanol to provide 2-[(4-amino-1,2-dimethyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]-1-morpholin-1-ylethanone p-toluenesulfonate as a white solid.

Part G

Claisen Reagent, prepared from potassium hydroxide (35 g), water (25 mL), and methanol (100 mL), was added to the material from Part F, and the mixture was stirred for one hour. Hydrochloric acid (6 N) was added until the pH of the reaction mixture was neutral. A precipitate formed and was isolated by filtration to provide 0.01 g of 2-[(4-amino-1,2-dimethyl-1H-imidazo[4,5-c]quinolin-8-yl)oxy]acetic acid as an orange solid, mp 298° C. (decomposition).

Example 45 N-(2-{4-Amino-2-ethoxymethyl-7-[6-(methanesulfonylamino)hexyloxy]-1H-imidazo[4,5-c]quinolin-1-yl}-1,1-dimethylethyl)methanesulfonamide

Part A

7-Benzyloxy-4-chloro-3-nitroquinoline (14.5 g, 46.0 mmol), prepared as described in Parts A-D of Example 1, was treated according to the general method described in Part E of Example 1. 1,2-Diamino-2-methylpropane (5.29 mL, 50.6 mmol) was used in lieu of isobutylamine. After the work-up, the crude product was passed through a layer of silica gel (eluting sequentially with chloroform and 96:4 chloroform:methanol) to provide 12.4 g of (2-amino-2-methylpropyl)(7-benzyloxy-3-nitroquinolin-4-yl)amine as a yellow solid.

Part B

Under a nitrogen atmosphere, a solution of (2-amino-2-methylpropyl)(7-benzyloxy-3-nitroquinolin-4-yl)amine (12.4 g, 33.9 mmol) in dichloromethane (400 mL) was cooled to 0° C. Triethylamine (9.43 mL, 67.8 mmol) and methanesulfonic anhydride (5.90 g, 33.9 mmol) were sequentially added, and the reaction was stirred at ambient temperature for two hours. An analysis by HPLC indicated that the reaction was incomplete, and additional methanesulfonic anhydride (1.4 g, 8.0 mmol) was added. The reaction was stirred for an additional 90 minutes, and additional methanesulfonic anhydride (0.7 g, 4 mmol) was added. The reaction was stirred for an additional three hours, and saturated aqueous sodium bicarbonate (200 mL) was added. A precipitate began to form in the organic layer, which was separated and concentrated under reduced pressure to provide a yellow solid. The solid was triturated with water (200 mL) with heating, isolated by filtration, washed with water (3×100 mL) and diethyl ether (3×50 mL), and dried overnight under vacuum to provide 14.8 g of N-[1,1-dimethyl-2-(3-nitro-7-benzyloxyquinolin-4-ylamino)ethyl]methanesulfonamide as a yellow powder.

Part C

N-[1,1-Dimethyl-2-(3-nitro-7-benzyloxyquinolin-4-ylamino)ethyl]methanesulfonamide (14.8 g, 33.3 mmol) was mixed with acetonitrile (300 mL) and added to a Parr flask; 5% platinum on carbon (2 g) was added. The reaction was flushed with nitrogen and placed under hydrogen pressure (40 psi, 2.8×10⁵ Pa) for 5.5 hours with the hydrogen replaced after two hours. An analysis by TLC indicated the presence of starting material. Additional acetonitrile (200 mL) and 5% platinum on carbon (2 g) were added, and the reaction was placed under hydrogen pressure overnight. The reaction mixture was filtered through a layer of CELITE filter aid, and the filter cake was washed with acetonitrile. The filtrate was concentrated under reduced pressure. Toluene and dichloromethane were added and removed under reduced pressure twice to yield 12.6 g of N-[2-(3-amino-7-benzyloxyquinolin-4-ylamino)-1,1-dimethylethyl]methanesulfonamide as a solid.

Part D

Under a nitrogen atmosphere, a solution of N-[2-(3-amino-7-benzyloxyquinolin-4-ylamino)-1,1-dimethylethyl]methanesulfonamide (12.6 g, 30.4 mmol) in dichloromethane (300 mL) was cooled to ˜0° C.; triethylamine (4.23 mL, 30.4 mmol) was added. Ethoxy acetyl chloride (3.33 mL, 30.4 mmol) was added dropwise, and the reaction was stirred at ambient temperature for 1.5 hours. The volatiles were removed under reduced pressure, and the residue was dissolved in ethanol (300 mL). Triethylamine (13 mL) was added, and the reaction was heated at reflux overnight and allowed to cool to ambient temperature. The volatiles were removed under reduced pressure. The residue was dissolved in dichloromethane (300 mL), and the resulting solution was washed with water (2×100 mL) and brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure to provide a brown oil. The oil was purified by column chromatography on silica gel (eluting with 97.5:2.5 chloroform:methanol) to provide 12.4 g of N-[2-(7-benzyloxy-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl)-1,1-dimethylethyl]methanesulfonamide as a beige solid.

Part E

A solution of N-[2-(7-benzyloxy-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl)-1,1-dimethylethyl]methanesulfonamide (9.38 g, 19.5 mmol) in ethanol (150 mL) was added to a Parr vessel containing 10% palladium on carbon (0.83 g). The reaction was placed under hydrogen pressure (50 psi, 3.4×10⁵ Pa) over two nights. Starting material remained as evidenced by a TLC analysis, and additional 10% palladium on carbon (1.02 g) was added. The reaction was continued for an additional eight hours. The reaction mixture was filtered through a layer of CELITE filter aid, and the filter cake was washed with ethanol and methanol. The filtrate was concentrated under reduced pressure, and the residue was several times dissolved in toluene and concentrated under reduced pressure to yield a yellow powder, which was dried under high vacuum to provide 7.37 g of N-[2-(2-ethoxymethyl-7-hydroxy-1H-imidazo[4,5-c]quinolin-1-yl)-1,1-dimethylethyl]methanesulfonamide as a yellow solid.

Part F

The methods described in Parts J and K of Example 2 were followed using 6-amino-1-hexanol (62 g, 0.53 mmol) in lieu of 2-aminoethanol to provide tert-butyl 6-iodohexylcarbamate as a light-yellow oil.

Part G

The general method described in Part L of Example 2 was followed. N-[2-(2-Ethoxymethyl-7-hydroxy-1H-imidazo[4,5-c]quinolin-1-yl)-1,1-dimethylethyl]methanesulfonamide (7.37 g, 18.8 mmol) was treated with tert-butyl 6-iodohexylcarbamate (6.75 g, 20.6 mmol). The crude product was purified by column chromatography on silica gel (eluting sequentially with 95:5 and 92.5:7.5 dichloromethane:methanol) to provide 8.5 g of tert-butyl {6-[2-ethoxymethyl-1-(2-methanesulfonylamino-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-1-yloxy]hexyl}carbamate as a white solid.

Part H

A modification of the method described in Part M of Example 2 was used to convert tert-butyl {6-[2-ethoxymethyl-1-(2-methanesulfonylamino-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-1-yloxy]hexyl}carbamate (8.5 g, 14.4 mmol) to tert-butyl {6-[2-ethoxymethyl-1-(2-methanesulfonylamino-2-methylpropyl)-5-oxido-1H-imidazo[4,5-c]quinolin-1-yloxy]hexyl}carbamate, which was obtained as a orange solid. The reaction was complete in two hours, and the product was used without purification.

Part I

Ammonium hydroxide (20 mL) and p-toluenesulfonyl chloride (2.74 g, 14.4 mmol) were added sequentially with rapid stirring to a mixture of the material from Part H in dichloromethane (150 mL), and the reaction was stirred for two hours. The organic layer was then washed with saturated aqueous sodium bicarbonate (2×) and brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure to provide tert-butyl {6-[4-amino-2-ethoxymethyl-1-(2-methanesulfonylamino-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-1-yloxy]hexyl}carbamate as a red solid.

Part J

A modification of the method described in Part O of Example 2 was used to deprotect tert-butyl {6-[4-amino-2-ethoxymethyl-1-(2-methanesulfonylamino-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-1-yloxy]hexyl}carbamate with hydrochloric acid in ethanol (50 mL of 4.25 M). Following the treatment of the crude product with ammonium hydroxide and the remainder of the work-up procedure, 6.86 g of N-{2-[4-amino-7-(6-aminohexyloxy)-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}methanesulfonamide were obtained as a tan solid and used without further purification.

Part K

A suspension of N-{2-[4-amino-7-(6-aminohexyloxy)-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}methanesulfonamide (1.50 g, 2.96 mmol) in dichloromethane (50 mL) was cooled to 0° C.; triethylamine (825 μL, 5.92 mmol) and methanesulfonic anhydride (0.67 g, 3.85 mmol) were sequentially added. The reaction was stirred at 0° C. for 30 minutes, allowed to warm to room temperature, and stirred for four hours. The reaction solution was washed with saturated aqueous sodium bicarbonate (2×) and brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (eluting with 90:10 dichloromethane:methanol) and recrystallization from dichloroethane. The crystals were partitioned between dichloromethane and saturated aqueous sodium bicarbonate, and the aqueous layer was extracted with dichloromethane. The combined organic fractions were washed with brine, dried over sodium sulfate, filtered, concentrated under reduced pressure, and further dried for two days under high vacuum at 60° C. to provide 0.39 g of N-(2-{4-amino-2-ethoxymethyl-7-[6-(methanesulfonylamino)hexyloxy]-1H-imidazo[4,5-c]quinolin-1-yl}-1,1-dimethylethyl)methanesulfonamide as an off-white solid, mp 176-180° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.16 (d, J=9.4 Hz, 1H), 7.27 (s, 1H), 7.03 (d, J=2.5 Hz, 1H), 6.93 (m, 1H), 6.84 (dd, J=8.7, 2.5 Hz, 1H), 6.53 (s, 2H), 4.81 (s, 4H), 4.04 (t, J=6.2 Hz, 2H), 3.53 (m, 2H), 2.99 (s, 3H), 2.94 (m, 2H), 2.87 (s, 3H), 1.76 (m, 2H), 1.50-1.27 (m, 12H), 1.14 (m, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 157.9, 152.6, 150.0, 147.7, 134.9, 125.4, 122.6, 111.4, 109.5, 108.4, 67.5, 65.7, 65.1, 57.7, 54.6, 44.7, 42.8, 29.7, 29.0, 26.3, 25.8, 25.6, 15.3;

MS (APCI) m/z 585 (M+H)⁺;

Anal. Calcd. for C₂₅H₄₀N₆O₆S₂.0.30H₂O: % C, 50.88; % H, 6.94; % N, 14.24. Found: % C, 50.85; % H, 6.83; % N, 14.10.

Example 46 N-(6-{[4-Amino-2-ethoxymethyl-1-(2-methanesulfonylamino-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}hexyl)acetamide

A modification of the method described in Park K of Example 45 was followed using acetyl chloride (0.23 mL, 3.26 mmol) in lieu of methanesulfonic anhydride. A precipitate was present at the end of the reaction and was isolated by filtration, stirred with water for 30 minutes, and isolated by filtration. The remaining reaction solution was subjected to the aqueous work-up procedure. The two solids were combined and purified by column chromatography on silica gel (eluting sequentially with 90:10 and 85:15 dichloromethane:methanol) to provide 0.51 g of N-(6-{[4-amino-2-ethoxymethyl-1-(2-methanesulfonylamino-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}hexyl)acetamide as an off-white powder, mp 169-171° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.17 (d, J=9.4 Hz, 1H), 7.79 (m, 1H), 7.28 (s, 1H), 7.04 (d, J=2.5 Hz, 1H), 6.85 (dd, J=8.7, 2.5 Hz, 1H), 6.56 (s, 2H), 4.82 (s, 4H), 4.04 (m, 2H), 3.54 (q, J=6.9 Hz, 2H), 3.02 (m, 2H), 2.99 (s, 3H), 1.79 (s, 3H), 1.75 (m, 2H), 1.45-1.28 (m, 12H), 1.14 (m, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 169.2, 157.9, 152.6, 150.0, 147.6, 134.9, 125.4, 122.6, 111.4, 109.5, 108.4, 67.6, 65.7, 65.1, 57.7, 54.6, 44.7, 38.8, 29.5, 29.0, 26.6, 25.8, 25.7, 22.9, 15.3;

MS (APCI) m/z 549 (M+H)⁺;

Anal. Calcd. for C₂₆H₄₀N₆O₅S: % C, 56.91; % H, 7.35; % N, 15.32. Found: % C, 56.70; % H, 7.49; % N, 15.26.

Example 47 N-(4-{4-Amino-7-[6-(methanesulfonylamino)hexyloxy]-2-propyl-1H-imidazo[4,5-c]quinolin-1-yl}butyl)methanesulfonamide

Part A

Under a nitrogen atmosphere, a solution of tert-butyl N-(4-aminobutyl)carbamate (13.8 g, 73.4 mmol) and triethylamine (15.3 mL, 110 mmol) was cooled to 0° C. Methanesulfonyl chloride (6.3 mL, 81 mmol) was added, and the reaction was allowed to warm to ambient temperature and stirred overnight. Aqueous acetic acid (200 mL of 10%) was added. The organic layer was then separated and washed with water (200 mL), saturated aqueous sodium bicarbonate (200 mL), water (200 mL), and brine; dried over sodium sulfate, filtered, and concentrated under reduced pressure to provide 18.9 g of tert-butyl[4-(methanesulfonylamino)butyl]carbamate as an off-white solid.

Part B

A solution of hydrochloric acid in ethanol was added to a solution of tert-butyl[4-(methanesulfonylamino)butyl]carbamate (18.9 g, 71.1 mmol) in ethanol (100 mL), and the reaction was heated at 100° C. for two hours. The solvent was removed under reduced pressure. A mixture of dichloromethane:hexanes was added to the resulting oil and removed under reduced pressure; this process was repeated several times. The residue was dried for three days under vacuum to provide 14.3 g of N-(4-aminobutyl)methanesulfonamide hydrochloride as a tan solid.

Part C

A modification of the method described in Part E of Example 1 was used to treat 7-benzyloxy-4-chloro-3-nitroquinoline (14.4 g, 45.8 mmol) with N-(4-aminobutyl)methanesulfonamide hydrochloride (10.2 g, 50.4 mmol) and triethylamine (19.2 mL, 137 mmol). The reaction mixture was concentrated under reduced pressure, and the residue was triturated with water while heating at reflux. The resulting solid was isolated by filtration, washed with water and diethyl ether (2×100 mL), and dried under high vacuum to provide 16.8 g of N-[4-(3-nitro-7-benzyloxyquinolin-4-ylamino)butyl]methanesulfonamide as a yellow powder.

Part D

The method described in Part C of Example 45 was used to convert N-[4-(3-nitro-7-benzyloxyquinolin-4-ylamino)butyl]methanesulfonamide (16.8 g, 37.8 mmol) to 15.1 g of N-[4-(3-amino-7-benzyloxyquinolin-4-ylamino)butyl]methanesulfonamide, which was obtained as a dark yellow solid.

Part E

The method described in Part D of Example 45 was used to treat N-[4-(3-amino-7-benzyloxyquinolin-4-ylamino)butyl]methanesulfonamide (15.1 g, 36.5 mmol) with butyryl chloride (4.77 mL, 46.2 mmol). The crude product was purified by column chromatography on silica gel (eluting with 96:4 chloroform:methanol containing ammonium hydroxide) to provide 11.8 g of N-[4-(7-benzyloxy-2-propyl-1H-imidazo[4,5-c]quinolin-1-yl)butyl]methanesulfonamide as a tan solid.

Part F

The method described in Part E of Example 45 was used to convert N-[4-(7-benzyloxy-2-propyl-1H-imidazo[4,5-c]quinolin-1-yl)butyl]methanesulfonamide (7.60 g, 16.3 mmol) to 5.75 g of N-[4-(7-hydroxy-2-propyl-1H-imidazo[4,5-c]quinolin-1-yl)butyl]methanesulfonamide, which was obtained as a light-yellow solid.

Part G

The general method described in Part L of Example 2 was followed. N-[4-(7-hydroxy-2-propyl-1H-imidazo[4,5-c]quinolin-1-yl)butyl]methanesulfonamide (5.75 g, 15.3 mmol) was treated with tert-butyl 6-iodohexylcarbamate (5.50 g, 16.8 mmol). The crude product was purified by column chromatography on silica gel (eluting sequentially with 95:5 and 92.5:7.5 dichloromethane:methanol) to provide 6.19 g of tert-butyl(6-{1-[4-(methanesulfonylamino)butyl]-2-propyl-1H-imidazo[4,5-c]quinolin-1-yloxy}hexyl)carbamate as a yellow solid.

Part H

A modification of the method described in Part M of Example 2 was used to convert tert-butyl(6-{1-[4-(methanesulfonylamino)butyl]-2-propyl-1H-imidazo[4,5-c]quinolin-1-yloxy}hexyl)carbamate (2.51 g, 4.36 mmol) to 2.54 g of tert-butyl(6-{1-[4-(methanesulfonylamino)butyl]-5-oxido-2-propyl-1H-imidazo[4,5-c]quinolin-1-yloxy}hexyl)carbamate, which was obtained as a yellow solid. The reaction was allowed to run overnight, and the product was used without purification.

Part I

The method described in Part I of Example 45 was used to convert tert-butyl(6-{1-[4-(methanesulfonylamino)butyl]-5-oxido-2-propyl-1H-imidazo[4,5-c]quinolin-1-yloxy}hexyl)carbamate (2.54 g, 4.29 mmol) to 2.51 g of tert-butyl(6-{4-amino-1-[4-(methanesulfonylamino)butyl]-2-propyl-1H-imidazo[4,5-c]quinolin-1-yloxy}hexyl)carbamate, obtained as a tan solid.

Part J

The method described in Part J of Example 45 was used to deprotect tert-butyl(6-{4-amino-1-[4-(methanesulfonylamino)butyl]-2-propyl-1H-imidazo[4,5-c]quinolin-1-yloxy}hexyl)carbamate (2.51 g, 4.25 mmol). The crude product was recrystallized from acetonitrile to provide 0.75 g of N-{4-[4-amino-7-(6-aminohexyloxy)-2-propyl-1H-imidazo[4,5-c]quinolin-1-yl]butyl}methanesulfonamide as a tan solid. The mother liquor was concentrated under reduced pressure, and the residue was recrystallized from dichloroethane to provide 0.48 g of N-{4-[4-amino-7-(6-aminohexyloxy)-2-propyl-1H-imidazo[4,5-c]quinolin-1-yl]butyl}methanesulfonamide as a brown powder.

Part K

A modification of the method described in Part K of Example 45 was followed using N-{4-[4-amino-7-(6-aminohexyloxy)-2-propyl-1H-imidazo[4,5-c]quinolin-1-yl]butyl}methanesulfonamide (0.86 g, 1.8 mmol) as the starting material. Methanesulfonic anhydride (470 mg, 2.7 mmol) was added over a period of 24 hours. The crude product was purified by column chromatography on silica gel (eluting sequentially with 90:10 and 85:15 dichloromethane:methanol), recrystallization from ethyl acetate, and a second recrystallization from 2-propanol to provide 0.38 g of N-(4-{4-amino-7-[6-(methanesulfonylamino)hexyloxy]-2-propyl-1H-imidazo[4,5-c]quinolin-1-yl}butyl)methanesulfonamide as a white powder, mp 138-140° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.92 (d, J=9.4 Hz, 1H), 7.05 (d, J=3.1 Hz, 1H), 6.98-6.88 (m, 3H), 6.38 (s, 2H), 4.46 (m, 2H), 4.04 (t, J=6.2 Hz, 2H), 2.99-2.92 (m, 6H), 2.87 (s, 3H), 2.86 (s, 3H), 1.82 (m, 6H), 1.61 (m, 2H), 1.44 (m, 6H), 1.03 (m, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 157.7, 152.4, 152.2, 146.7, 133.1, 125.3, 121.4, 112.1, 109.2, 108.3, 67.6, 44.6, 42.8, 42.4, 39.53, 39.49, 29.7, 29.0, 28.7, 27.4, 26.7, 26.3, 25.6, 21.3, 14.2;

MS (APCI) m/z 569 (M+H)⁺;

Anal. Calcd. for C₂₅H₄₀N₆O₅S₂: % C, 52.80; % H, 7.09; % N, 14.78. Found: % C, 52.61; % H, 7.13; % N, 14.52.

Example 48 N-(6-{4-Amino-1-[4-(methanesulfonylamino)butyl]-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy}hexyl)acetamide

A modification of the method described in Park K of Example 45 was followed using acetyl chloride (135 μL, 1.91 mmol) in lieu of methanesulfonic anhydride and N-{4-[4-amino-7-(6-aminohexyloxy)-2-propyl-1H-imidazo[4,5-c]quinolin-1-yl]butyl}methanesulfonamide (0.85 g, 1.7 mmol) as the starting material. The crude product was purified by column chromatography on silica gel (eluting sequentially with 90:10 and 80:20 dichloromethane:methanol). The resulting white powder was stirred with water, isolated by filtration, and dissolved in 50:50 dichloromethane:methanol. The solution was dried over sodium sulfate, filtered, and concentrated under reduced pressure. The resulting solid was recrystallized from acetonitrile, and the crystals were dissolved in dichloromethane:methanol, concentrated under reduced pressure, and further dried overnight under high vacuum at 60° C. to provide 0.30 g of N-(6-{4-amino-1-[4-(methanesulfonylamino)butyl]-2-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy}hexyl)acetamide as a white powder, mp 168-172° C.

¹H NMR (300 MHz, CDCl₃) δ 7.91 (d, J=9.4 Hz, 1H), 7.78 (m, 1H), 7.04 (d, J=2.5 Hz, 1H), 6.98 (m, 1H), 6.89 (dd, J=9.4, 2.5 Hz, 1H), 6.35 (s, 2H), 4.46 (m, 2H), 4.03 (t, J=6.2 Hz, 2H), 3.04-2.96 (m, 4H), 2.86 (m, 5H), 1.78 (m, 9H), 1.62 (m, 2H), 1.42 (m, 6H), 1.03 (t, J=7.5 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 169.2, 157.8, 152.4, 152.3, 146.9, 133.1, 125.3, 121.4, 112.1, 109.2, 108.4, 67.6, 44.6, 42.4, 39.5, 38.8, 29.5, 29.0, 28.7, 27.4, 26.6, 25.7, 23.0, 21.3, 14.2;

MS (APCI) m/z 533 (M+H)⁺;

Anal. Calcd. for C₂₆H₄₀N₆O₄S.0.25H₂O: % C, 58.13; % H, 7.60; % N, 15.64; % S, 5.97.

Found: % C, 57.90; % H, 7.69; % N, 15.54; % S, 6.23.

Example 49 N-(2-{4-Amino-2-ethoxymethyl-7-[6-(methanesulfonylamino)hexyloxy]-1H-imidazo[4,5-c]quinolin-1-yl}-1,1-dimethylethyl)acetamide

Part A

Under a nitrogen atmosphere, a solution of (2-amino-2-methylpropyl)(7-benzyloxy-3-nitroquinolin-4-yl)amine (6.5 g, 17.5 mmol), prepared in Part A of Example 45, in dichloromethane (200 mL) was cooled to 0° C.; triethylamine (4.87 mL, 35.0 mmol) and acetyl chloride (1.37 mL, 19.2 mmol) were sequentially added. The reaction was stirred at 0° C. for 30 minutes, allowed to warm to ambient temperature, and stirred for three hours. The reaction was washed with saturated aqueous sodium bicarbonate (2×) and brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure to provide N-[1,1-dimethyl-2-(3-nitro-7-benzyloxyquinolin-4-ylamino)ethyl]acetamide as a yellow powder.

Part B

The method described in Part C of Example 45 was used to convert the material from Part B to 6.16 g of N-[2-(3-amino-7-benzyloxyquinolin-4-ylamino)-1,1-dimethylethyl]acetamide, obtained as an orange solid.

Part C

A modification of the method described in Part D of Example 45 was followed using N-[2-(3-amino-7-benzyloxyquinolin-4-ylamino)-1,1-dimethylethyl]acetamide (6.16 g, 21.0 mmol) as the starting material. A solution of the intermediate in ethanol was heated at reflux for 24 hours. Sodium hydroxide (1.25 g) and water (25 mL) were added, and the reaction was heated at reflux for an additional 32 hours. The mixture was allowed to cool to ambient temperature, and the solvent was removed under reduced pressure. The residue was partitioned between dichloromethane and saturated aqueous sodium bicarbonate. The organic layer was separated and washed sequentially with saturated aqueous sodium bicarbonate and brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The resulting orange solid was purified by column chromatography on silica gel (eluting with 95:5 dichloromethane:methanol) to provide 4.79 g of N-[2-(7-benzyloxy-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl)-1,1-dimethylethyl]acetamide as a yellow solid.

Part D

The method described in Part E of Example 45 was used to convert N-[2-(7-benzyloxy-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl)-1,1-dimethylethyl]acetamide (4.79 g, 10.7 mmol) to N-[2-(2-ethoxymethyl-7-hydroxy-1H-imidazo[4,5-c]quinolin-1-yl)-1,1-dimethylethyl]acetamide, obtained as a yellow solid.

Part E

The method described in Part L of Example 2 was followed. The material from Part D was treated with tert-butyl 6-iodohexylcarbamate (3.86 g, 11.8 mmol), and the reaction was complete in four hours. The crude product was purified by column chromatography on silica gel (eluting sequentially with 95:5 and 92.5:7.5 dichloromethane:methanol), and the resulting solid was dried overnight under high vacuum to provide 4.69 g of tert-butyl {6-[1-(2-acetylamino-2-methylpropyl)-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-7-yloxy]hexyl}carbamate as an off-white solid.

Part F

A modification of the method described in Part M of Example 2 was used to convert tert-butyl {6-[1-(2-acetylamino-2-methylpropyl)-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-7-yloxy]hexyl}carbamate (4.69 g, 8.44 mmol) to tert-butyl {6-[1-(2-acetylamino-2-methylpropyl)-2-ethoxymethyl-5-oxido-1H-imidazo[4,5-c]quinolin-7-yloxy]hexyl}carbamate, obtained as a orange solid. The reaction was complete in one hour, and the product was used without purification.

Part G

The method described in Part I of Example 45 was used to convert the material from Part F to 4.85 g of tert-butyl {6-[1-(2-acetylamino-2-methylpropyl)-4-amino-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-7-yloxy]hexyl}carbamate, obtained as an orange solid.

Part H

A modification of the method described in Part O of Example 2 was used to deprotect the material from Part G with hydrochloric acid in ethanol (100 mL of 3 M). Following the treatment of the crude product with ammonium hydroxide and the remainder of the work-up procedure, 3.64 g of N-{2-[4-amino-7-(6-aminohexyloxy)-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}acetamide were obtained as a tan solid and used without further purification.

Part I

A modification of the method described in Part K of Example 45 was followed using N-{2-[4-amino-7-(6-aminohexyloxy)-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}acetamide (1.2 g, 2.5 mmol) as the starting material. The reaction was run in 1-methyl-2-pyrrolidone (55 mL), and after completion, the reaction was poured into deionized water (400 mL) and stirred over three days. The mixture was extracted with dichloromethane (3×200 mL), and the combined extracts were washed with brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was dissolved in diethyl ether (100 mL) and treated with a solution of hydrochloric acid in ethanol. A solid formed, and the diethyl ether was decanted. The solid was partitioned between dichloromethane and dilute ammonium hydroxide. The aqueous layer was separated and extracted with dichloromethane (3×100 mL). The combined organic fractions were washed with brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The resulting orange oil was triturated with diethyl ether overnight to form a solid, which was isolated by filtration and purified by column chromatography on silica gel (eluting with 92:8 dichloromethane:methanol). The resulting solid was dried overnight under high vacuum at 60° C. to provide 0.47 g of N-(2-{4-amino-2-ethoxymethyl-7-[6-(methanesulfonylamino)hexyloxy]-1H-imidazo[4,5-c]quinolin-1-yl}-1,1-dimethylethyl)acetamide as an off-white powder.

¹H NMR (300 MHz, DMSO-d₆) δ 8.20 (d, J=9.1 Hz, 1H), 7.70 (s, 1H), 7.01 (d, J=2.7 Hz, 1H), 6.92 (m, 1H), 6.84 (m, 1H), 6.50 (s, 2H), 4.93 (s, 2H), 4.69 (s, 2H), 4.03 (m, 2H), 3.50 (q, J=7.0 Hz, 2H), 2.92 (m, 2H), 2.86 (s, 3H), 1.80 (s, 3H), 1.74 (m, 2H), 1.48-1.38 (m, 6H), 1.18 (br s, 6H), 1.11 (t, J=7.0 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 170.3, 157.9, 152.6, 149.8, 147.6, 135.0, 125.3, 122.6, 111.4, 109.6, 108.4, 67.6, 65.7, 64.6, 55.0, 51.1, 42.8, 29.7, 29.0, 26.3, 25.9, 25.6, 24.0, 15.3; MS (APCI) m/z 549 (M+H)⁺;

Anal. Calcd. for C₂₆H₄₀N₆O₅S.0.70H₂O: % C, 55.64; % H, 7.44; % N, 14.97. Found: % C, 55.98; % H, 7.29; % N, 14.87.

Example 50 N-(2-{7-[6-(Acetylamino)hexyloxy]-4-amino-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl}-1,1-dimethylethyl)acetamide

A modification of the method described in Part K of Example 45 was followed using N-{2-[4-amino-7-(6-aminohexyloxy)-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}acetamide (1.2 g, 2.5 mmol) as the starting material and acetyl chloride (200 μL, 3 mmol) in lieu of methanesulfonic anhydride. Following chromatographic purification, the solid was recrystallized from acetonitrile, and the crystals were dissolved in dichloromethane:methanol, concentrated under reduced pressure, and further dried under high vacuum at 60° C. to provide 0.47 g of N-(2-{7-[6-(acetylamino)hexyloxy]-4-amino-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl}-1,1-dimethylethyl)acetamide as a white powder, mp 190-192° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.20 (d, J=9.0 Hz, 1H), 7.77 (m, 1H), 7.70 (s, 1H), 7.01 (d, J=2.6 Hz, 1H), 6.83 (dd, J=9.0, 2.6 Hz, 1H), 6.50 (s, 2H), 4.93 (s, 2H), 7.69 (s, 2H), 4.02 (t, J=6.4 Hz, 2H), 3.50 (m, 2H), 3.01 (m, 2H), 1.80 (s, 3H), 1.77 (s, 3H), 1.74 (m, 2H), 1.41 (m, 6H), 1.18 (br s, 6H), 1.11 (t, J=7.0, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 170.3, 169.2, 157.9, 152.6, 149.8, 147.6, 135.0, 125.4, 122.6, 111.4, 109.6, 108.4, 67.6, 65.7, 64.6, 55.0, 51.6, 38.8, 29.5, 29.0, 26.6, 25.9, 25.7, 24.0, 23.0, 15.3;

MS (APCI) m/z 513 (M+H)⁺;

Anal. Calcd. for C₂₇H₄₀N₆O₄.0.8H₂O: % C, 61.53; % H, 7.96; % N, 15.95. Found: % C, 61.65; % H, 8.05; % N, 15.88.

Example 51 N-[2-(4-Amino-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy)ethyl]methanesulfonamide

Part A

The methods described in Parts A-H, M, and N of Example 2 were followed using 3-benzyloxyaniline in lieu of 4-benzyloxyaniline. The crude product was recrystallized from acetonitrile to provide 7-benzyloxy-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as a flocculent, white solid, mp 188-189° C.

¹H NMR (300 MHz, DMSO-d₆): δ 7.91 (d, J=9.1 Hz, 1H), 7.52-7.30 (m, 5H), 7.13 (d, J=2.7 Hz, 1H), 7.00 (dd, J=8.9, 2.6 Hz, 1H), 6.53 (s, 2H), 5.21 (s, 2H), 4.74 (s, 2H), 4.49-4.44 (m, 2H), 3.54 (q, J=7.0 Hz, 2H), 1.92-1.78 (m, 2H), 1.15 (t, J=6.9 Hz, 3H), 1.00 (t, J=7.4 Hz, 3H).

¹³C NMR (75 MHz, DMSO-d₆): δ 157.3, 152.3, 148.1, 146.9, 137.2, 133.4, 128.4, 127.7, 127.6, 124.9, 121.3, 111.9, 108.9, 108.7, 69.1, 65.3, 64.2, 46.6, 23.0, 14.9, 10.7.

MS (ESI) m/z 391.2134 (391.2117 calcd for C₂₃H₂₆N₄O₂, M+H⁺).

Anal. Calcd. for C₂₃H₂₆N₄O₂: % C, 70.75; % H, 6.71; % N, 14.35. Found: % C, 70.49; % H, 6.57; % N, 14.22.

Part B

7-Benzyloxy-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (3.9 g, 9.99 mmol) was mixed with ethanol and added to a Parr flask charged with 10% palladium on carbon (0.390 g) in ethanol. The flask was placed under hydrogen pressure and shaken for 18 hours. The reaction mixture was filtered through a layer of CELITE filter aid, and the filter cake was washed with warm DMF. The filtrate was concentrated under reduced pressure, and the residue was recrystallized from methanol to yield 2.4 g of 4-amino-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol as a white solid, mp>250° C.

¹H NMR (300 MHz, DMSO-d₆): δ 9.50 (s, 1H), 7.82 (d, J=8.9 Hz, 1H), 6.96 (d, J=2.5 Hz, 1H), 6.81 (dd, J=8.8, 2.6 Hz, 1H), 6.45 (s, 2H), 4.73 (s, 2H), 4.47-4.41 (m, 2H), 3.54 (q, J=7.0 Hz, 2H), 1.92-1.78 (m, 2H), 1.15 (t, J=6.9 Hz, 3H), 1.00 (t, J=7.4 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆): δ 156.4, 152.1, 147.7, 147.1, 133.6, 124.5, 121.2, 112.0, 109.8, 107.9, 65.2, 64.2, 46.6, 23.0, 14.9, 10.7;

Anal. Calcd. for C₁₆H₂₀N₄O₂: % C, 63.98; % H, 6.71; % N, 18.65. Found: % C, 63.71; % H, 6.48; % N, 18.53.

Part C

The method described in Part L of Example 2 was used to treat 4-amino-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol (1.89 g, 6.29 mmol) with cesium carbonate (4.10 g, 12.6 mmol) and tert-butyl 2-iodoethylcarbamate (1.79 g, 6.60 mmol). Following chromatographic purification, the product was recrystallized from acetonitrile to provide 1.26 g of tert-butyl[2-(4-amino-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy)ethyl]carbamate as a flocculent, white solid.

Part D

The method described in Part O of Example 2 was used to treat the material from Part C with 4 M hydrochloric acid in ethanol to provide 7-(2-aminoethoxy)-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine, which was used without purification.

Part E

A suspension of 7-(2-aminoethoxy)-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.570 g, 1.66 mmol) in dichloromethane (11 mL) was cooled to 0° C. Methanesulfonic anhydride (0.303 g, 1.74 mmol) was added, and the mixture was stirred for 16 hours and allowed to warm to ambient temperature. Saturated aqueous sodium carbonate (25 mL) was added, and the mixture was stirred for 20 minutes. The aqueous layer was separated and extracted with chloroform (3×50 mL). The combined organic fractions were washed sequentially with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting white solid was purified by column chromatography on silica gel (eluting with chloroform:methanol:ammonium hydroxide ranging in ratios from 99.6:0.36:0.04 to 97:2.7:0.3) and subsequent recrystallization from acetonitrile to yield 0.500 g of N-[2-(4-amino-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-yloxy)ethyl]methanesulfonamide as white, granular powder mp 182-184.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.93 (d, J=9.1 Hz, 1H), 7.31 (t, J=6.2 Hz, 1H), 7.08 (d, J=3.2 Hz, 1H), 6.95 (dd, J=9.1, 2.6 Hz, 1H), 6.54 (s, 2H), 4.75 (s, 2H), 4.50-4.45 (m, 2H), 4.13 (t, J=5.6 Hz, 2H), 3.55 (q, J=7.0 Hz, 2H), 3.39 (q, J=5.8 Hz, 2H), 2.98 (s, 3H), 1.93-1.79 (m, 2H), 1.16 (t, J=7.0 Hz, 3H), 1.01 (t, J=7.3 Hz, 3H);

MS (APCI) m/z 422.1864 (422.1862 calcd for C₁₉H₂₇N₅O₄S, M+H);

Anal. Calcd. for C₁₉H₂₇N₅O₄S: % C, 54.14; % H, 6.46; % N, 16.61; % S, 7.61. Found: % C, 54.23; % H, 6.50; % N, 16.66; % S, 7.63.

Example 52 1-[4-Amino-2-ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-7-yloxy]-3,3-dimethylbutan-2-one

Part A

The methods described in Parts E, F, and G of Example 1 were used to convert 7-benzyloxy-4-chloro-3-nitroquinoline, prepared in Parts A-D of Example 1, to 7-benzyloxy-2-ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinoline. 2-Phenoxyethylamine was used in lieu of isobutylamine in Part E, and triethyl orthopropionate was used in lieu of trimethyl orthobutyrate in Part G.

Part B

The method described in Part J of Example 1 was used to convert 7-benzyloxy-2-ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinoline to 2-ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-7-ol.

Part C

A suspension of 2-ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-7-ol (1.0 g, 3.0 mmol) and cesium carbonate (1.49 g, 4.57 mmol) in DMF was stirred for 15 minutes; 1-bromopinacolone (0.6 mL, 4.5 mmol) was added dropwise. The reaction was heated at 65° C. and stirred for 20 hours, and then the solvent was removed under reduced pressure. The residue was dissolved in dichloromethane, and the resulting solution was washed sequentially with water (3×) and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure to provide 1.3 g of 1-[2-ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-7-yloxy]-3,3-dimethylbutan-2-one as an orange solid.

¹H NMR (300 MHz, DMSO-d₆) δ 9.06 (s, 1H), 8.44 (d, J=9.3 Hz, 1H), 7.45 (d, J=2.5 Hz, 1H), 7.34 (dd, J=9.1, 2.5 Hz, 1H), 7.23-7.18 (m, 2H), 6.91-6.86 (m, 1H), 6.78-6.75 (m, 2H), 5.32 (s, 2H), 5.05-4.98 (m, 2H), 4.44 (t, J=5.0 Hz, 2H), 3.08 (q, J=7.3 Hz, 2H), 1.43 (t, J=7.6 Hz, 3H), 1.23 (s, 9H).

Part D

The method described in Part M of Example 2 was used to oxidize 1-[2-ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-7-yloxy]-3,3-dimethylbutan-2-one (1.3 g, 3.0 mmol) to 1.4 g of 1-[2-ethyl-5-oxido-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-7-yloxy]-3,3-dimethylbutan-2-one, which was isolated as an orange solid and used without purification.

¹H NMR (300 MHz, DMSO-d₆) δ 8.96 (s, 1H), 8.55 (d, J=9.2 Hz, 1H), 8.12 (d, J=2.2 Hz, 1H), 7.48 (dd, J=9.3, 3.0 Hz, 1H), 7.23-7.17 (m, 2H), 6.91-6.86 (m, 1H), 6.76-6.73 (m, 2H), 5.38 (s, 2H), 5.04-4.99 (m, 2H), 4.44 (t, J=5.0 Hz, 2H), 3.07 (q, J=7.5 Hz, 2H), 1.41 (t, J=7.1 Hz, 3H), 1.24 (s, 9H).

Part E

Ammonium hydroxide (6 mL) was added to a solution of the material from Part D in dichloromethane (20 mL). p-Toluenesulfonyl chloride (0.629 g, 3.30 mmol) was added in two portions, and the mixture was stirred for 16 hours. The mixture was then diluted with dichloromethane and water. The aqueous layer was separated and extracted twice with chloroform. The combined organic fractions were washed sequentially with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting white solid was recrystallized from acetonitrile twice to yield 0.360 g of 1-[4-amino-2-ethyl-1-(2-phenoxyethyl)-1H-imidazo-[4,5-c]quinolin-7-yloxy]-3,3-dimethylbutan-2-one as feathery, white needles, mp 238-239° C. (decomposition).

¹H NMR (300 MHz, DMSO-d₆) δ 8.06 (d, J=9.2 Hz, 1H), 7.24-7.2 (m, 2H), 6.96 (d, J=2.5 Hz, 1H), 6.92-6.86 (m, 2H), 6.84-6.80 (m, 2H), 6.36 (s, 2H), 5.19 (s, 2H), 4.96-4.88 (m, 2H), 4.40 (t, J=5.0 Hz, 2H), 3.01 (q, J=7.5 Hz, 2H), 1.40 (t, J=7.2 Hz, 3H), 1.20 (s, 9H);

MS (APCI) m/z 447.2402 (447.2396 calcd for C₂₆H₃₀N₄O₃, M+H);

Anal. Calcd. for C₂₆H₃₀N₄O₃.1.0H₂O: % C, 67.22; % H, 6.94; % N, 12.06. Found: % C, 67.29; % H, 6.81; % N, 12.03.

Example 53 2-Ethyl-7-(2-morpholin-4-yl-2-oxoethoxy)-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-4-amine

Part A

The methods described in Parts A-D of Example 30 were used to convert 7-benzyloxy-N⁴-(2-phenoxyethyl)quinoline-3,4-diamine to 2-ethyl-7-(2-morpholin-4-yl-2-oxoethoxy)-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinoline. In Part D, after the reaction mixture was filtered, the filtrate was allowed to stand for three days. Crystals formed and were isolated by filtration and washed with diethyl ether. The filtrate was concentrated under reduced pressure, and the resulting oil with triturated with a mixture of ethyl acetate and water. The resulting solid was isolated by filtration, washed with diethyl ether, and combined with the crystals isolated from the reaction mixture. The combined solids were recrystallized from methanol, isolated by filtration, washed with cold hexanes, and dried overnight under high vacuum at 70° C. to provide 2-ethyl-7-(2-morpholin-4-yl-2-oxoethoxy)-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinoline as a white solid, mp 190-191° C.

Anal. Calcd. for C₂₆H₂₈N₄O₄: % C, 67.81; % H, 6.13; % N, 12.17. Found: % C, 67.44; % H, 6.20; % N, 12.05.

Part B

The method described in Part E of Example 30 was used to convert 2-ethyl-7-(2-morpholin-4-yl-2-oxoethoxy)-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinoline (0.855 g, 1.86 mmol) to 0.92 g of 2-ethyl-7-(2-morpholin-4-yl-2-oxoethoxy)-5-oxido-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinoline.

Part C

Under a nitrogen atmosphere, trichloroacetyl isocyanate (0.35 mL, 2.9 mmol) was added dropwise to a solution of the material from Part B in anhydrous dichloromethane (335 mL), and the reaction was stirred for two hours. The solvent was removed under reduced pressure. The residue was diluted with methanol (23 mL), and a solution of sodium methoxide (0.17 mL, 2.9 mmol, 25% in methanol) was slowly added. The reaction was stirred overnight, and a precipitate formed. The precipitate was isolated by filtration, washed with three times with cold hexanes, and recrystallized from ethyl acetate to provide 0.495 g of 2-ethyl-7-(2-morpholin-4-yl-2-oxoethoxy)-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-4-amine as a white powder, mp 208-209° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.07 (d, J=9.3 Hz, 1H), 7.22 (m, 2H), 7.05 (d, J=2.7 Hz, 1H), 6.90 (t, J=2.7 Hz, 1H), 6.90 (d, J=9.0 Hz, 1H), 6.82 (d, J=0.9 Hz, 1H), 6.79 (d, J=0.9 Hz, 1H), 6.39 (s, 2H), 4.91 (s, 4H), 4.39 (t, J=4.8 Hz, 2H), 3.54 (m, 8H), 3.01 (q, J=7.5 Hz, 2H), 1.40 (t, J=7.5 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 166.5, 158.2, 157.0, 154.4, 152.3, 146.8, 133.4, 129.8, 125.3, 121.7, 121.4, 114.6, 111.8, 109.6, 108.8, 66.7, 66.4, 66.3, 45.2, 44.6, 42.0, 20.3, 12.2;

MS (EI) m/z 476.2282 (476.2298 calcd for C₂₆H₂₉N₅O₄);

Anal. Calcd for C₂₆H₂₉N₅O₄: % C, 65.67; % H, 6.15; % N, 14.73. Found: % C, 65.48; % H, 6.01; % N, 14.59.

Example 54 1-(2-Methylpropyl)-2-propyl-7-(tetrahydropyran-2-ylmethoxy)-1H-imidazo[4,5-c]quinolin-4-amine

The methods described in Parts L-N of Example 2 were used to treat 1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-ol. In Part L, 2-(bromomethyl)tetrahydro-2H-pyran was used as the alkylating agent. The crude product was recrystallized from acetonitrile to yield 1-(2-methylpropyl)-2-propyl-7-(tetrahydropyran-2-ylmethoxy)-1H-imidazo[4,5-c]quinolin-4-amine as tan crystals, mp 126° C. (decomposition).

¹H NMR (300 MHz, DMSO-d₆) δ 7.85 (d, J=9.6 Hz, 1H), 7.03 (d, J=3.0 Hz, 1H), 6.90 (dd, J=9.2, 2.9 Hz, 1H), 6.37 (s, 2H), 4.28 (d, J=7.6 Hz, 2H), 4.02-3.86 (m, 3H), 3.71-3.61 (m, 1H), 3.46-3.34 (m, 1H), 2.86 (t, J=7.8 Hz, 2H), 2.21-2.05 (m, 1H), 1.90-1.77 (m, 3H), 1.72-1.63 (m, 1H), 1.58-1.27 (m, 4H), 1.02 (t, J=7.4 Hz, 3H), 0.91 (d, J=6.7 Hz, 6H);

MS (APCI) m/z 397.2600 (397.2604 calcd for C₂₃H₃₂N₄O₂, M+H);

Anal. Calcd. for C₂₃H₃₂N₄O₂.0.75H₂O: % C, 67.37; % H, 8.23; % N, 13.66. Found: % C, 67.06; % H, 8.06; % N, 13.52.

Example 55 1-(2-Methylpropyl)-2-propyl-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinolin-4-amine

Part A

3-Hydroxytetrahydrofuran (0.375 mL, 4.64 mmol) was added to a suspension of 1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-7-ol (1.0 g, 3.5 mmol) and triphenylphosphine (1.5 g, 5.7 mmol) in THF. Diisopropyl azodicarboxylate (1.1 mL, 5.6 mmol) was added dropwise over a period of three minutes, and the reaction was stirred for 48 hours. The solvent was removed under reduced pressure, the residue was purified by column chromatography on silica gel (eluting with 98:2 dichloromethane:methanol) to provide 1.1 g of 1-(2-methylpropyl)-2-propyl-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinoline as an off-white, crystalline solid.

Part B

The method described in Part M of Example 2 was used to treat 1-(2-methylpropyl)-2-propyl-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinoline (1.1 g, 3.1 mmol) with mCPBA (1.07 g, 3.72 mmol). The crude product was purified by column chromatography on silica gel to afford 0.588 g of 1-(2-methylpropyl)-5-oxido-2-propyl-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinoline as a yellow solid.

Part C

The method described in Part E of Example 52 was used to aminate the material from Part B. The crude product was recrystallized from acetonitrile to afford 0.242 g of 1-(2-methylpropyl)-2-propyl-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinolin-4-amine as white needles, mp 178-182° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.87 (d, J=9.0 Hz, 1H), 7.02 (d, J=2.7 Hz, 1H), 6.89 (dd, J=8.9, 2.7 Hz, 1H), 6.40 (s, 2H), 5.13-5.09 (m, 1H), 4.29 (d, J=7.3 Hz, 2H), 3.96-3.73 (m, 4H), 2.86 (t, J=7.5 Hz, 2H), 2.33-1.97 (m, 3H), 1.84 (sextet, J=7.5 Hz, 2H), 1.02 (t, J=7.4 Hz, 3H), 0.91 (d, J=6.4 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 155.6, 152.6, 152.0, 146.4, 132.7, 125.2, 121.4, 112.0, 109.2, 109.0, 76.9, 72.3, 66.4, 51.2, 32.5, 28.7, 28.5, 20.9, 19.1, 13.8;

MS (APCI) m/z 369.2298 (369.2291 calcd for C₂₁H₂₈N₄O₂, M+H);

Anal. Calcd. for C₂₁H₂₈N₄O₂: % C, 68.45; % H, 7.66; % N, 15.20. Found: % C, 68.11; % H, 7.87; % N, 15.01.

Example 56 2-(2-Methoxyethyl)-1-propyl-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinolin-4-amine

The methods described in Parts A and B of Example 51 were used to prepare 2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol, which was treated according to the methods described in Example 55. The crude product was purified by column chromatography on silica gel and subsequent recrystallization from 2-propanol to afford 2-(2-methoxyethyl)-1-propyl-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinolin-4-amine as a tan powder, mp 192-194° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.90 (d, J=9.2 Hz, 1H), 7.02 (d, J=2.6 Hz, 1H), 6.89 (dd, J=9.0, 2.6 Hz, 1H), 6.41 (s, 2H), 5.14-5.10 (m, 1H), 4.46-4.41 (m, 2H), 3.97-3.74 (m, 6H), 3.30 (s, 3H), 3.16 (t, J=6.8 Hz, 2H), 2.33-2.21 (m, 1H), 2.08-1.98 (m, 1H), 1.87-1.74 (m, 2H), 0.98 (t, J=7.4 Hz, 3H);

MS (APCI) m/z 371.2074 (371.2083 calcd for C₂₀H₂₆N₄O₃, M+H);

Anal. Calcd. for C₂₀H₂₆N₄O₃: % C, 64.85; % H, 7.07; % N, 15.12. Found: % C, 64.88; % H, 7.03; % N, 15.20.

Examples 57-92

An acid chloride (1.1 equivalents) was added to a culture tube containing a solution of 7-(3-aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine (4.4 mg/mL) in chloroform (5 mL). The culture tubes were capped and placed on a shaker overnight (18 hours). The volatiles were removed by vacuum centrifugation. The compounds were purified by preparative high performance liquid chromatography (prep HPLC) using a Waters Fraction Lynx automated purification system. The prep HPLC fractions were analyzed using a Micromass LC-TOFMS, and the appropriate fractions were centrifuge evaporated to provide the trifluoroacetate salt of the desired compound. (Column: Phenomenex Luna C18(2), 21.2×50 mm, 10 micron particle size, 100 Å pore; flow rate: 25 mL/min.; non-linear gradient elution from 5-95% B in 9 min, then hold at 95% B for 2 min., where A is 0.05% trifluoroacetic acid/water and B is 0.05% trifluoroacetic acid/acetonitrile; fraction collection by mass-selective triggering.) The table below shows the structure made in each example and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 57-92

Measured Mass Example R (M + H) 57

424.2727 58

426.2879 59

440.3047 60

456.2622 61

460.2736 62

466.2288 63

466.3162 64

474.2877 65

478.2616 66

480.2419 67

480.3356 68

485.2668 69

485.2667 70

486.2862 71

488.3015 72

490.2820 73

495.2273 74

496.2515 75

498.3105 76

500.3048 77

502.3173 78

504.2619 79

504.2990 80

506.2589 81

510.2873 82

518.2742 83

518.3122 84

518.3502 85

520.2934 86

520.2920 87

524.2440 88

527.2756 89

528.2599 90

528.2592 91

532.3278 92

544.2535

Examples 93-129

The method described for Examples 57-92 was used to treat 1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine with acid chlorides. The table below shows the structure made in each example and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 93-129

Mea- Ex- sured am- Mass ple R (M + H)  93

478.3181  94

480.3352  95

494.3478  96

510.3051  97

514.3151  98

520.2748  99

520.3622 100

528.3341 101

532.3076 102

534.2899 103

534.3823 104

539.3121 105

539.3130 106

540.3336 107

542.3503 108

544.3304 109

544.3291 110

549.2761 111

552.3552 112

554.3510 113

556.3687 114

558.3102 115

558.3455 116

560.3093 117

564.3351 118

572.3240 119

572.3680 120

572.3984 121

574.3419 122

574.3412 123

578.2916 124

582.3076 125

582.3096 126

582.2361 127

586.3799 128

598.3027 129

612.4310

Examples 130-161

The method described for Examples 57-92 was used to treat 8-(2-aminoethoxy)-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine with acid chlorides. The table below shows the structure made in each example and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 130-161

Measured Mass Example R (M + H) 130

414.2480 131

428.2674 132

444.2262 133

448.2362 134

454.1902 135

454.2825 136

462.2513 137

466.2257 138

468.2071 139

468.2960 140

473.2296 141

474.2487 142

476.2667 143

478.2455 144

478.2453 145

483.1922 146

484.2175 147

486.2725 148

488.2654 149

490.2791 150

492.2255 151

492.2588 152

494.2204 153

498.2528 154

506.2372 155

506.2751 156

508.2549 157

508.2546 158

516.2205 159

516.2219 160

516.1549 161

520.2924

Examples 162-189

The method described for Examples 57-92 was used to treat 7-(3-aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine with sulfonyl chlorides. The table below shows the structure made in each example and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 162-189

Measured Ex- Mass ample R (M + H) 162

448.2388 163

462.2542 164

463.2517 165

476.2714 166

514.2286 167

521.2303 168

521.2302 169

521.2334 170

522.2527 171

526.2491 172

532.2197 173

536.1563 174

538.2829 175

540.2260 176

546.2551 177

546.2537 178

547.2464 179

555.2372 180

564.2252 181

564.1624 182

568.2946 183

570.3129 184

570.3125 185

574.2169 186

580.2222 187

588.2659 188

589.2966 189

635.2490

Examples 190-217

The method described for Examples 57-92 was used to treat 1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine with sulfonyl chlorides. The table below shows the structure made in each example and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 190-217

Measured Mass Example R (M + H) 190

502.2851 191

516.2997 192

517.2976 193

530.3141 194

550.2875 195

556.2460 196

568.2739 197

569.2917 198

575.2827 199

575.2785 200

580.2991 201

590.2044 202

592.3352 203

594.2772 204

600.3042 205

601.2969 206

609.2883 207

618.2733 208

622.3428 209

624.3610 210

624.3606 211

626.3162 212

628.2621 213

634.2709 214

642.3131 215

643.3466 216

689.2985 217

696.2326

Examples 218-242

The method described for Examples 57-92 was used to treat 8-(2-aminoethoxy)-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine with sulfonyl chlorides. The table below shows the structure made in each example and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 218-242

Measured Ex- Mass ample R (M + H) 218

436.2036 219

450.2162 220

451.2139 221

464.2341 222

484.2017 223

502.1901 224

503.2099 225

509.1982 226

509.1957 227

509.1964 228

510.2191 229

514.2129 230

520.1815 231

524.1172 232

526.2491 233

535.2117 234

543.2015 235

552.1878 236

558.2752 237

558.2780 238

560.2318 239

562.1780 240

568.1868 241

577.2585 242

623.2094

Examples 243-284

The method described for Examples 57-92 was used to treat 7-(3-aminopropoxy)-1-(2-methylpropyl)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine with isocyanates or carbamoyl chlorides. The table below shows the structure made in each example and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 243-284

Measured Ex- Mass ample R (M + H) 243

441.3011 244

455.3159 245

427.2842 246

475.2837 247

481.3302 248

485.2899 249

489.2988 250

453.2988 251

491.2608 252

455.3156 253

500.2784 254

503.2751 255

503.3134 256

503.3156 257

503.3123 258

467.3150 259

505.2916 260

469.2950 261

509.2340 262

511.3764 263

515.3130 264

517.2918 265

517.3308 266

518.3246 267

483.3452 268

521.2693 269

521.2685 270

525.2961 271

489.2985 272

528.3100 273

533.3608 274

543.2682 275

543.2704 276

543.2021 277

547.3023 278

549.3399 279

553.3261 280

557.2203 281

567.3111 282

567.3104 283

567.3091 284

581.3271

Examples 285-322

The method described for Examples 57-92 was used to treat 1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-2-propyl-1H-imidazo[4,5-c]quinolin-4-amine with isocyanates or carbamoyl chlorides. The table below shows the structure made in each example and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 285-322

Measured Ex- Mass ample R (M + H) 285

495.3449 286

509.3607 287

509.3616 288

481.3298 289

535.3751 290

539.3303 291

543.3445 292

507.3424 293

509.3565 294

554.3253 295

557.3626 296

557.3613 297

557.3580 298

521.3593 299

559.3403 300

523.3367 301

563.2794 302

565.4229 303

569.3617 304

571.3754 305

572.3731 306

573.3036 307

537.3932 308

575.3166 309

543.3455 310

582.3604 311

582.3961 312

587.4092 313

597.3188 314

597.3159 315

597.2525 316

601.3510 317

607.3763 318

611.2715 319

621.3568 320

621.3579 321

621.3558 322

635.3752

Examples 323-365

The method described for Examples 57-92 was used to treat 8-(2-aminoethoxy)-2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine with isocyanates or carbamoyl chlorides. The table below shows the structure made in each example and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 323-365

Measured Mass Example R (M + H) 323

429.2625 324

443.2764 325

443.2767 326

415.2455 327

463.2470 328

469.2912 329

473.2515 330

477.2578 331

441.2581 332

479.2237 333

443.2777 334

488.2429 335

491.2392 336

491.2771 337

491.2736 338

491.2767 339

455.2770 340

493.2577 341

457.2596 342

497.1951 343

499.3385 344

503.2771 345

505.2913 346

506.2881 347

507.2170 348

471.3080 349

509.2324 350

509.2308 351

513.2603 352

477.2582 353

516.2743 354

516.3096 355

521.3214 356

527.2079 357

531.2340 358

531.2343 359

535.2642 360

541.2932 361

545.1819 362

555.2700 363

555.2697 364

555.2692 365

569.2889

Example 366 4-Amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl isopropylcarbamate

Part A

The methods described in Parts A-I of Example 2 were followed using 3-benzyloxyaniline in lieu of 4-benzyloxyaniline and methoxypropionyl chloride in lieu of ethoxyacetyl chloride. 2-(2-Methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol (2.0 g, 7.0 mmol), 4-(dimethylamino)pyridine (0.085 g, 0.70 mmol), and tetrahydrofuran (70 mL) were combined, and the mixture was cooled to 7° C. with an ice/water bath. Isopropyl isocyanate (0.689 mL, 7.01 mmol) was added dropwise to the mixture. After 20 minutes the cooling bath was removed and the reaction was stirred for an additional 24 hours. Analysis by HPLC indicated that no product had formed. Di-butyltin dilaurate (1 drop) was added, and the reaction was stirred at ambient temperature for 2.5 hours and then heated at reflux for 48 hours. The solvent was evaporated under reduced pressure, and the residue was dissolved in dichloromethane. The organic fraction was washed sequentially with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. Purification by column chromatography on silica gel (eluting with a chloroform:methanol:ammonium hydroxide gradient) provided 1.97 g of 2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl isopropylcarbamate as a white solid.

Part B

2-(2-Methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl isopropylcarbamate (1.89 g, 5.10 mmol) was dissolved in chloroform (41 mL). 3-Chloroperoxybenzoic acid (60% pure, 1.60 g, 5.56 mmol) was added in one portion. After 30 minutes the golden solution was diluted with ammonium hydroxide (41 mL), and p-toluenesulfonyl chloride (0.927 g, 4.86 mmol) was added. The reaction was stirred for 1.5 hours. The layers were separated and the aqueous fraction was extracted with dichloromethane. The organic fractions were combined, washed sequentially with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The solid residue was recrystallized from acetonitrile to provide 0.986 g of 4-amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl isopropylcarbamate as a granular, peach-colored solid, mp 144.0-146.0° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.96 (d, J=9.0 Hz, 1H), 7.68 (d, J=7.62 Hz, 1H), 7.22 (d, J=2.43 Hz, 1H), 7.01 (dd, J=2.5, 8.9 Hz, 1H), 6.53 (s, 2H), 4.48-4.43 (m, 2H), 3.81 (t, J=6.7 Hz, 2H), 3.67 (sextet, J=6.8 Hz, 1H), 3.28 (s, 3H), 3.17 (t, J=6.7 Hz, 2H), 1.81 (sextet, J=7.4 Hz, 2H), 1.14 (d, J=6.6 Hz, 6H), 0.97 (t, J=7.3 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 153.5, 152.1, 150.5, 149.5, 145.7, 132.2, 126.0, 120.5, 117.4, 116.0, 111.9, 70.1, 58.1, 46.1, 42.6, 27.1, 23.0, 22.4, 10.6;

MS (ESI) m/z 386.2177 (386.2192 calcd for C₂₀H₂₇N₅O₃, M+H);

Anal. Calcd. for C₂₀H₂₇N₅O₃: % C, 62.32; % H, 7.06; % N, 18.17. Found: % C, 62.02; % H, 6.94; % N, 17.92.

Example 367 4-Amino-2-ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-7-yl methanesulfonate

Part A

2-Ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-7-ol (1.5 g, 4.5 mmol), chloroform (45 mL), and triethylamine (0.697 mL, 5.00 mmol) were combined. Methanesulfonyl chloride (0.348 mL, 4.50 mmol) was added dropwise to the mixture; a flocculent precipitate formed. The reaction was stirred for 72 hours and then quenched with methanol. The volatiles were removed under reduced pressure, and the residue was purified by column chromatography on silica gel (eluting with a dichloromethane:methanol gradient) to provide 0.628 g of 2-ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-7-yl methanesulfonate as a white solid.

Part B

2-Ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-7-yl methanesulfonate (0.625 g, 1.52 mmol) was dissolved in chloroform (15 mL). 3-Chloroperoxybenzoic acid (60% pure, 0.437 g, 1.52 mmol) was added in one portion, and the reaction was stirred for 25 minutes. Ammonium hydroxide (25 mL) was added. A precipitate formed, and the reaction was stirred until the precipitate dissolved. p-Toluenesulfonyl chloride (0.290 g, 1.52 mmol) was added in one portion, and the reaction mixture was stirred for an additional 16 hours. The layers were separated, and the aqueous fraction was extracted with dichloromethane followed by chloroform. The organics were combined, washed sequentially with water and brine, dried over sodium sulfate, filtered and concentrated under reduced pressure. Purification by column chromatography on silica gel (eluting with a chloroform:methanol:ammonium hydroxide gradient) followed by recrystallization from acetonitrile provided 0.150 g of 4-amino-2-ethyl-1-(2-phenoxyethyl)-1H-imidazo[4,5-c]quinolin-7-yl methanesulfonate as an orange solid, mp 213.0-214.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.26 (d, J=9.0 Hz, 1H), 7.50 (d, J=2.5 Hz, 1H), 7.23-7.17 (m, 3H), 6.88 (t, J=7.3 Hz, 1H), 6.80-6.76 (m, 2H), 6.67 (s, 2H), 4.98-4.94 (m, 2H), 4.42-4.39 (m, 2H), 3.39 (s, 3H), 3.04 (q, J=7.5 Hz, 2H), 1.40 (t, J=7.5 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 157.8, 155.3, 152.6, 147.4, 145.7, 132.4, 129.5, 126.4, 122.0, 121.0, 118.2, 115.0, 114.2, 113.8, 66.4, 44.4, 37.2, 20.0, 11.7;

MS (ESI) m/z 427.1444 (427.1440 calcd for C₂₁H₂₂N₄O₄S, M+H);

Anal. Calcd. for C₂₁H₂₂N₄O₄S: % C, 59.14; % H, 5.20; % N, 13.14; % S, 7.52. Found: % C, 58.90; % H, 4.95; % N, 13.13; % S, 7.55.

Example 368 N-(2-{4-Amino-2-(ethoxymethyl)-7-[(6-{[(isopropylamino)carbonothioyl]amino}hexyl)oxy]-1H-imidazo[4,5-c]quinolin-1-yl}-1,1-dimethylethyl)acetamide

Isopropyl isothiocyanate (255 μL, 2.38 mmol) was added to a stirred suspension of N-{2-[4-amino-7-(6-aminohexyloxy)-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}acetamide (prepared as described in Part I of Example 49, 1.02 g, 2.17 mmol) in dichloromethane (100 mL) at 0° C. The mixture was stirred for 30 minutes at 0° C., then was allowed to warm to room temperature and was stirred over the weekend. The solution was concentrated under reduced pressure. The crude product was purified by flash chromatography (silica gel, gradient elution with 7.5-10% methanol in dichloromethane) followed by recrystallization from acetonitrile. The crystals were dissolved in 1:1 dichloromethane/methanol and the resulting solution was concentrated under reduced pressure to afford a white powder that was dried under vacuum at 60° C. to yield 0.43 g of N-(2-{4-amino-2-(ethoxymethyl)-7-[(6-{[(isopropylamino)carbonothioyl]amino}hexyl)oxy]-1H-imidazo[4,5-c]quinolin-1-yl}-1,1-dimethylethyl)acetamide as a white powder, mp 110-120° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.22 (d, J=9.0 Hz, 1H), 7.71 (s, 1H), 7.23 (br s, 1H), 7.11 (d, J=7.8 Hz, 1H), 7.03 (d, J=2.6 Hz, 1H), 6.85 (dd, J=9.0, 2.6 Hz, 1H), 6.51 (s, 2H), 4.94 (s, 2H), 4.70 (s, 2H), 4.22 (br s, 1H), 4.04 (t, J=6.3 Hz, 2H), 3.51 (q, J=7.0 Hz, 2H), 1.81 (s, 3H), 1.76 (m, 2H), 1.48 (m, 4H), 1.36 (m, 2H), 1.19 (s, 6H), 1.12-1.07 (m, 11H);

¹³C NMR (75 MHz, DMSO-d₆) δ 181.3, 170.3, 157.9, 152.6, 149.8, 147.6, 135.0, 125.3, 122.6, 111.4, 109.6, 108.4, 67.6, 65.7, 64.6, 55.0, 51.1, 45.1, 43.6, 29.1, 29.0, 26.6, 25.9, 25.7, 24.0, 22.7, 15.3;

MS (APCI) m/z 572 (M+H)⁺;

Anal. calcd for C₂₉H₄₅N₇O₃S.0.40H₂O: C, 60.16; H, 7.97; N, 16.93; S, 5.54. Found: C, 60.16; H, 8.08; N, 16.84; S, 5.54.

Example 369 N-(2-{4-Amino-2-(ethoxymethyl)-7-[(6-{[(isopropylamino)carbonyl]amino}hexyl)oxy]-1H-imidazo[4,5-c]quinolin-1-yl}-1,1-dimethylethyl)-N′-isopropylurea

Part A

Isopropyl isocyanate (2.05 mL, 20.9 mmol) was added to a stirred suspension of (2-amino-2-methylpropyl)(7-benzyloxy-3-nitroquinolin-4-yl)amine (prepared as described in Part A of Example 45, 6.95 g, 19.0 mmol) in dichloromethane (200 mL) at 0° C. After approximately 30 minutes, the reaction mixture was allowed to warm to room temperature and was stirred overnight. The solvent was removed under reduced pressure to afford 8.49 g of N-(2-{[7-(benzyloxy)-3-nitroquinolin-4-yl]amino}-1,1-dimethylethyl)-N′-isopropylurea.

Part B

A mixture of N-(2-{[7-(benzyloxy)-3-nitroquinolin-4-yl]amino}-1,1-dimethylethyl)-N′-isopropylurea (4.24 g, 9.39 mmol) and 5% platinum on carbon (1.0 g) in acetonitrile (700 mL) was hydrogenated at 30 psi (2.1×10⁵ Pa) overnight on a Parr apparatus. The mixture was filtered through CELITE filter agent, which was subsequently rinsed with acetonitrile and dichloromethane. The filtrate was concentrated under reduced pressure to yield 3.67 g of N-(2-{[3-amino-7-(benzyloxy)quinolin-4-yl]amino}-1,1-dimethylethyl)-N′-isopropylurea as a pale yellow foam that was used without purification.

Part C

The material from Part B was combined with N-(2-{[3-amino-7-(benzyloxy)quinolin-4-yl]amino}-1,1-dimethylethyl)-N′-isopropylurea from another experiment, suspended in toluene, and concentrated under reduced pressure. The N-(2-{[3-amino-7-(benzyloxy)quinolin-4-yl]amino}-1,1-dimethylethyl)-N′-isopropylurea (4.57 g, 10.8 mmol) was converted into N-{2-[7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}-N′-isopropylurea using the method described in Part D of Example 45. The crude product was purified using flash chromatography (silica gel, elution with 6% methanol in dichloromethane) to afford 3.81 g of N-{2-[7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}-N′-isopropylurea as an off white solid.

Part D

A mixture of N-{2-[7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}-N′-isopropylurea (3.82 g, 7.80 mmol) and 10% palladium on carbon (0.92 g) in ethanol (100 mL) was hydrogenated at 50 psi (3.5×10⁵ Pa) overnight on a Parr apparatus. The mixture was filtered through CELITE filter agent and the filtrate was concentrated under reduced pressure to yield 3.17 g of N-{2-[2-(ethoxymethyl)-7-hydroxy-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}-N′-isopropylurea as a yellow solid.

Part E

Following the method described in Part L of Example 2, N-{2-[2-(ethoxymethyl)-7-hydroxy-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}-N′-isopropylurea (3.12 g, 7.80 mmol) was treated with tert-butyl 6-iodohexylcarbamate (2.81 g, 8.58 mmol) to afford 4.31 g of tert-butyl 6-{[2-(ethoxymethyl)-1-(2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}hexylcarbamate. The material was used without purification in the next step.

Part F

A modification of the method described in Part M of Example 2 was used to convert tert-butyl 6-{[2-(ethoxymethyl)-1-(2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}hexylcarbamate (4.31 g, 7.20 mmol) into tert-butyl 6-{[2-(ethoxymethyl)-1-(2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl)-5-oxido-1H-imidazo[4,5-c]quinolin-7-yl]oxy}hexylcarbamate, which was used without purification in the next step.

Part G

The material from Part F was converted into 4.20 g of tert-butyl 6-{[4-amino-2-(ethoxymethyl)-1-(2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}hexylcarbamate using the method described in Part I of Example 45.

Part H

A solution of tert-butyl 6-{[4-amino-2-(ethoxymethyl)-1-(2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}hexylcarbamate (4.20 g, 6.84 mmol) in 3 M HCl in ethanol (50 mL, 150 mmol) was heated at reflux for five minutes, then was allowed to cool to room temperature and was concentrated under reduced pressure. The resulting orange solid was dissolved water and the solution was washed with dichloromethane (2×). The aqueous layer was treated with ammonium hydroxide until a basic pH was reached, then was extracted with dichloromethane (3×). The combined organic layers were washed with brine, dried over sodium sulfate, filtered, and concentrated to yield 2.98 g of N-{2-[4-amino-7-[(6-aminohexyl)oxy]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}-N′-isopropylurea as a dark orange solid.

Part I

Isopropyl isocyanate (190 μL, 1.93 mmol) was added to a stirred solution of N-{2-[4-amino-7-[(6-aminohexyl)oxy]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}-N′-isopropylurea (0.90 g, 1.75 mmol) in dichloromethane (50 mL) at 0° C. After approximately 30 minutes, the solution was allowed to warm to room temperature. A precipitate formed and the mixture was stirred over the weekend. The solvent was removed under reduced pressure and the crude product was purified by flash chromatography (silica gel, gradient elution with 8-10% methanol in dichloromethane) to provide a solid that was dried under vacuum at 60° C. to yield 0.34 g of N-(2-{4-amino-2-(ethoxymethyl)-7-[(6-{[(isopropylamino)carbonyl]amino}hexyl)oxy]-1H-imidazo[4,5-c]quinolin-1-yl}-1,1-dimethylethyl)-N′-isopropylurea as a tan solid, mp 205-209° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.22 (d, J=9.1 Hz, 1H), 7.03 (d, J=2.5 Hz, 1H), 6.85 (dd, J=9.0, 2.5 Hz, 1H), 6.57 (s, 2H), 5.70-5.65 (m, 3H), 5.57 (d, J=7.7 Hz, 1H), 4.93 (s, 2H), 4.70 (br s, 2H), 4.04 (t, J=6.3 Hz, 2H), 3.73-3.63 (m, 2H), 3.51 (q, J=7.0 Hz, 2H), 2.97 (m, 2H), 175 (m, 2H), 1.44-1.35 (m, 8H), 1.12 (t, J=7.0 Hz, 3H), 1.07-0.99 (m, 16H);

¹³C NMR (75 MHz, DMSO-d₆) δ 157.9, 157.8, 157.2, 152.5, 150.2, 147.3, 135.0, 125.3, 122.6, 111.5, 109.6, 108.2, 67.6, 65.6, 64.4, 54.2, 52.0, 41.1, 40.9, 39.4, 30.4, 29.1, 26.6, 26.4, 25.7, 23.6, 15.3;

MS (APCI) m/z 598 (M+H)⁺;

Anal. calcd for C₃₁H₅₀N₈O₄.1.00H₂O: C, 60.37; H, 8.50; N, 18.17. Found: C, 60.65; H, 8.66; N, 18.20.

Example 370 N-(6-{[4-Amino-2-(ethoxymethyl)-1-(2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}hexyl)acetamide

Acetyl chloride (180 μL, 2.53 mmol) was added to a stirred solution of N-{2-[4-amino-7-[(6-aminohexyl)oxy]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}-N′-isopropylurea (prepared as described in Parts A-H of Example 369, 1.18 g, 2.30 mmol) and triethylamine (0.64 mL, 4.60 mmol) in dichloromethane (100 mL) at 0° C. After approximately 20 minutes, the solution was allowed to warm to room temperature and was stirred overnight. The solution was transferred to a separatory funnel and washed with water (2×). The organic layer was dried over sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by flash chromatography (silica gel, elution with 10% methanol in dichloromethane) to yield 0.34 g of N-(6-{[4-amino-2-(ethoxymethyl)-1-(2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}hexyl)acetamide as a tan solid, mp 90-110° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.21 (d, J=9.1 Hz, 1H), 7.79 (m, 1H), 7.03 (d, J=2.6 Hz, 1H), 6.85 (dd, J=9.1, 2.6 Hz, 1H), 6.57 (s, 2H), 5.70-5.65 (m, 2H), 4.93 (s, 2H), 4.73 (br s, 2H), 4.04 (t, J=6.4 Hz, 2H), 3.72 (m, 1H), 3.51 (m, 2H), 3.03 (m, 2H), 1.78 (s, 3H), 1.76 (m, 2H), 1.42 (m, 10H), 1.12 (t, J=7.0 Hz, 3H), 1.07-1.04 (m, 8H);

¹³C NMR (125 MHz, DMSO-d₆) δ 169.2, 158.0, 157.3, 152.5, 150.3, 147.4, 135.1, 125.4, 122.6, 111.6, 109.8, 108.7, 67.8, 65.7, 64.5, 54.3, 52.2, 41.0, 38.9, 29.5, 29.0, 26.6, 26.5, 25.7, 23.6, 23.0, 15.3;

MS (APCI) m/z 556 (M+H)⁺;

Anal. calcd for C₂₉H₄₅N₇O₄.0.50H₂O: C, 61.68; H, 8.21; N, 17.36. Found: C, 61.81; H, 8.43; N, 17.22.

Example 371 N-(6-{[4-Amino-2-(ethoxymethyl)-1-(2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}hexyl)methanesulfonamide

Methanesulfonic anhydride (0.34 g, 1.93 mmol) was added to a stirred solution of N-{2-[4-amino-7-[(6-aminohexyl)oxy]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}-N′-isopropylurea (prepared as described in Parts A-H of Example 369, 10.9 g, 1.75 mmol) and triethylamine (0.35 mL, 3.5 mmol) in dichloromethane (50 mL) at 0° C. After approximately 30 minutes, the solution was allowed to warm to room temperature and was stirred overnight. The following morning, the solution was cooled to 0° C. and additional methanesulfonic anhydride (0.13 g) was added. After 30 minutes, the solution was allowed to warm to room temperature. After 2 hours, the solution was transferred to a separatory funnel and washed with water (2×) and brine. The organic layer was dried over sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by flash chromatography (silica gel, elution with 10% methanol in dichloromethane) followed purification by chromatography on a HORIZON HPFC system (an automated, modular high-performance flash purification product available from Biotage, Inc, Charlottesville, Va., USA) (silica gel, gradient elution with 0-40% CMA in chloroform where CMA is a solution of 80:18:2 chloroform/methanol/concentrated ammonium hydroxide) to yield 0.31 g of N-(6-{[4-amino-2-(ethoxymethyl)-1-(2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}hexyl)methanesulfonamide as an off white solid, mp 190-194° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.21 (d, J=9.1 Hz, 1H), 7.02 (d, J=2.6 Hz, 1H), 6.94 (t, J=5.8 Hz, 1H), 6.85 (dd, J=9.1, 2.6 Hz, 1H), 6.52 (s, 2H), 5.70 (s, 1H), 5.66 (d, J=7.6 Hz, 1H), 4.93 (s, 2H), 4.72 (br s, 2H), 4.04 (t, J=6.3 Hz, 2H), 3.72 (m, 1H), 3.51 (q, J=7.0 Hz, 2H), 2.94 (m, 2H), 2.87 (s, 3H), 1.76 (m, 2H), 1.50-1.30 (m, 12H), 1.21 (t, J=7.0 Hz, 3H), 1.05 (d, J=6.5 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 157.8, 157.2, 152.6, 150.1, 147.6, 134.9, 125.3, 122.6, 111.4, 109.7, 108.4, 67.5, 65.6, 64.4, 54.2, 51.9, 42.8, 40.9, 29.7, 29.0, 26.4, 26.3, 25.6, 23.6, 15.3;

MS (APCI) m/z 592 (M+H)⁺;

Anal. calcd for C₂₈H₄₅N₇O₅S.0.12H₂O: C, 56.57; H, 7.68; N, 16.49. Found: C, 56.25; H, 8.09; N, 16.37.

Example 372 tert-Butyl 2-{[4-amino-1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate

Part A

Triethylamine (31.88 mL, 228.77 mmol) followed by 2,2-dimethyl-1,3-dioxolan-4-methanamine (20.0 g, 152.51 mmol) were added to a solution of 7-benzyloxy-4-chloro-3-nitroquinoline (48.00 g, 152.51 mmol) in dichloromethane (400 mL), which was then stirred at ambient temperature for 6 hours. The crude reaction mixture was concentrated under reduced pressure, and the resulting solid was treated with water. The mixture was stirred for 1 hour. The solid was collected by filtration, washed with water, dried, suspended in diethyl ether (400 mL), sonicated, and the resulting precipitate material was collected by filtration. The product was dried under vacuum at 40° C. for 12 hours to afford 60.1 g of (7-benzyloxy-3-nitro-quinolin-4-yl)[(2,2-dimethyl[1,3]dioxolan-4-yl)methyl]amine as a yellow solid, mp 154-155° C.

¹H-NMR (300 MHz, CDCl₃) δ 9.74-9.62 (br m, 1H), 9.32 (s, 1H), 8.15 (d, J=9.4 Hz, 1H), 7.51-7.31 (m, 6H), 7.15 (dd, J=9.4, 2.7 Hz, 1H), 5.21 (s, 2H), 4.48-4.37 (m, 1H), 4.16-4.05 (m, 2H), 4.04-3.93 (m, 1H), 3.74 (dd, J=8.5, 5.9 Hz, 1H), 1.54 (s, 3H), 1.40 (s, 3H);

MS (APCI) m/z 410.1 (M+H)⁺.

Part B

A solution of sodium dithionate (85% pure, 135.07 g, 659.42 mmol) and potassium carbonate (101.27 g, 732.73 mmol) in water (450 mL) was added dropwise to a mechanically stirred mixture of ethyl viologen dibromide (1.1 g, 2.93 mmol) and (7-benzyloxy-3-nitro-quinolin-4-yl)[(2,2-dimethyl[1,3]dioxolan-4-yl)methyl]amine (60.0 g, 146.54 mmol) in dichloromethane (500 mL) and water (50 mL). The reaction mixture was stirred at ambient temperature overnight and then diluted with water (600 mL) and stirred for an additional 10 minutes. The organic phase was separated and the aqueous layer was reextracted with dichloromethane (400 mL). The combined organic layers were washed with water (800 mL) and brine (800 mL), dried over sodium sulfate, and concentrated under reduced pressure to afford 55.60 g of 7-benzyloxy-N⁴-[(2,2-dimethyl[1,3]dioxolan-4-yl)methyl]quinoline-3,4-diamine as a brown foam.

¹H-NMR (300 MHz, CDCl₃) δ 8.38 (s, 1H), 7.83 (d, J=9.3 Hz, 1H), 7.51-7.28 (m, 6H), 7.18 (dd, J=9.2, 2.5 Hz, 1H), 5.16 (s, 2H), 4.35 (br s, 1H), 4.30-4.18 (m, 1H), 4.02 (dd, J=8.3, 6.5 Hz, 1H), 3.81 (br s, 2H), 3.68 (dd, J=8.3, 6.1 Hz, 1H), 3.60-3.46 (m, 1H), 3.40-3.25 (m, 1H), 1.52 (s, 3H), 1.37 (s, 3H);

MS (APCI) m/z 380.0 (M+H)⁺.

Part C

Triethylamine (25.53 mL, 183.17 mmol) was added to a solution of 7-benzyloxy-N⁴-[(2,2-dimethyl[1,3]dioxolan-4-yl)methyl]quinoline-3,4-diamine (55.60 g, 146.54 mmol) in dichloromethane (500 mL) at 0° C. Dropwise addition of ethoxyacetyl chloride (22.45 g, 183.17 mmol) to the reaction mixture followed, and the reaction mixture was allowed to stir for 4 hours at ambient temperature. The reaction mixture was concentrated under reduced pressure and the residue was added to a mixture of triethylamine (61.3 mL, 440 mmol) in ethanol (350 mL) and heated to reflux for 16 hours. The reaction mixture was concentrated under reduced pressure, extracted with dichloromethane (3×300 mL), washed with water (300 mL) and brine (300 mL) and dried over sodium sulfate. The crude material was purified by flash column chromatography (silica gel, eluted with 5% CMA in chloroform) and concentrated under reduced pressure to give 42.5 g of material as a brown solid. The material was recrystallized from diethyl ether to afford 37.5 g of 7-benzyloxy-1-[(2,2-dimethyl[1,3]dioxolan-4-yl)methyl]-2-ethoxymethyl-1H-imidazo[4,5-c]quinoline as a white crystalline solid, mp 110-111° C.

¹H-NMR (300 MHz, CDCl₃) δ 9.23 (s, 1H), 8.16 (d, J=9.2 Hz, 1H), 7.75 (d, J=2.7 Hz, 1H), 7.55-7.31 (m, 6H), 5.25 (s, 2H), 5.00 (d, J=12.7 Hz, 1H), 4.93-4.75 (m, 3H), 4.72-4.60 (m, 1H), 4.18 (dd, J=8.6, 6.2 Hz, 1H), 3.87 (dd, J=8.7, 6.2 Hz, 1H), 3.63 (q, J=7.0 Hz, 2H), 1.45 (s, 3H), 1.29 (s, 3H), 1.25 (t, J=7.0 Hz, 3H); ¹³C-NMR (75 MHz, CDCl₃) δ 157.8, 150.9, 146.9, 145.7, 136.5, 135.4, 134.9, 128.7, 128.2, 127.7, 121.2, 118.9, 112.4, 111.5, 110.3, 74.7, 70.2, 66.8, 66.4, 65.5, 48.4, 26.6, 25.1, 15.0;

MS (APCI) m/z 448.1 (M+H)⁺;

Anal. calcd for C₂₆H₂₉N₃O₄: C, 69.78; H, 6.53; N, 9.39. Found: C, 69.82; H, 6.74; N, 9.34.

Part D

Palladium hydroxide (Pearlman's catalyst) (20% wt. % palladium on carbon, 2.2 g) was added to a solution of 7-benzyloxy-1-[(2,2-dimethyl[1,3]dioxolan-4-yl)methyl]-2-ethoxymethyl-1H-imidazo[4,5-c]quinoline (22.2 g, 49.6 mmol) in acetonitrile (400 mL) and the reaction mixture was hydrogenated (30 psi, 2.1×10⁵ Pa) for 24 hours on a Parr apparatus. The crude reaction mixture was diluted with 1:1 chloroform/methanol (1 L), then was filtered through a layer of CELITE filter agent. The filtrate was concentrated under reduced pressure and triturated with acetonitrile. The resulting crystalline material was collected by filtration, washed with acetonitrile, and dried to afford 16.55 g of 1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-ol as a white powder, mp 239-240° C.

MS (APCI) m/z 358.1 (M+H)⁺;

Anal. calcd for C₁₉H₂₃N₃O₄: C, 63.85; H, 6.49; N, 11.76. Found: C, 63.88; H, 6.78; N, 11.75.

Part E

Using a modification on the procedure described in Part L of Example 2, 1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-ol (8.50 g, 23.8 mmol) was treated with tert-butyl 2-iodoethylcarbamate (7.10 g, 26.2 mmol) and cesium carbonate (11.62 g, 35.67 mmol) in DMF (120 mL). During the workup, after the reaction mixture was concentrated under reduced pressure, the residue was treated with water (75 mL) and stirred for 30 minutes. A precipitate was isolated by filtration and washed with diethyl ether to yield 8.7 g of tert-butyl 2-{[1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate as an off-white solid, mp 152-153° C.

MS (ESI) m/z 501.3 (M+H)⁺;

Anal. calcd for C₂₆H₃₆N₄O₆: C, 62.38; H, 7.25; N, 11.19. Found: C, 62.33; H, 7.45; N, 11.08.

Part F

mCPBA (75% pure, 7.6 g, 34 mmol) was added to a stirred solution of tert-butyl 2-{[1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate (8.5 g, 17 mmol) in dichloromethane (100 mL) at room temperature. The reaction mixture was stirred for 4 hours, then was diluted with dichloromethane (50 mL), washed with 4% aqueous sodium carbonate (2×75 mL), brine (100 mL), and concentrated under reduced pressure. The residue was dissolved in dichloromethane (100 mL) and concentrated ammonium hydroxide (50 mL) was added. The mixture was cooled to 0° C. and p-toluenesulfonyl chloride (4.04 g, 21.2 mmol) was added in portions. The reaction mixture was allowed to warm to room temperature and was stirred for 16 hours, then was diluted with dichloromethane (200 mL) and washed with 2 M aqueous sodium carbonate (2×150 mL). The aqueous layer was back-extracted with dichloromethane (100 mL). The combined organic layers were washed with brine, dried over sodium sulfate, filtered, and concentrated. The solid was triturated with diethyl ether and isolated by filtration to yield 3.55 g of tert-butyl 2-{[4-amino-1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate as a white powder, mp 82-84° C.

MS (APCI) m/z 516.3 (M+H)⁺;

Anal. calcd for C₂₆H₃₇N₅O₆: C, 60.57; H, 7.23; N, 13.58. Found: C, 60.28; H, 7.55; N, 13.45.

Example 373 3-[4-Amino-7-(2-aminoethoxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]propane-1,2-diol dihydrochloride

A suspension of tert-butyl 2-{[4-amino-1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate (prepared in Example 372, 1.5 g, 2.9 mmol) in ethanol (20 mL) and 4.3 M HCl in ethanol (2.70 mL, 17.5 mmol) was heated at reflux overnight. The reaction mixture was allowed to cool to room temperature and a white solid was collected by filtration, washed with ethanol, and dried under vacuum at 60° C. to yield 0.85 g of 7-(2-aminoethoxy)-1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-4-amine dihydrochloride as a white solid, mp 221-223° C.

MS (APCI) m/z 376.1 (M+H)⁺;

Anal. calcd for C₂₆H₃₇N₅O₆.2.2HCl.0.5H₂O: C, 46.17; H, 6.09; N, 14.95. Found: C, 46.48; H, 6.13; N, 14.97.

Example 374 tert-Butyl 4-{[4-amino-1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate

Part A

A solution of diisopropyldiazodicarboxylate (0.710 g, 3.50 mmol) in tetrahydrofuran (6 mL) was added dropwise to a mixture of 1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-ol (prepared as described in Parts A-D of Example 372, 1.00 g, 2.80 mmol), tert-butyl 4-hydroxypiperidine-1-carboxylate (0.70 g, 3.50 mmol), and triphenylphosphine (0.920 g, 3.50 mmol) in tetrahydrofuran (35 mL) at 0° C. The resulting solution was allowed to warm to room temperature over 16 hours. The solution was concentrated under reduced pressure. The crude product was purified by chromatography (silica gel, gradient elution with 0-50% CMA in chloroform) to provide 1.16 g of tert-butyl 4-{[1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate as a white foam.

MS (ESI) m/z 541.4 (M+H)⁺.

Part B

Using the method described in Part F of Example 372, tert-butyl 4-{[1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate (12.66 g, 23.42 mmol) was converted into 7.04 g of tert-butyl 4-{[4-amino-1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate, which was isolated as a white solid, mp 158-159° C.

MS (ESI) m/z 556.6 (M+H)⁺;

Anal. calcd for C₂₉H₄₁N₅O₆: C, 62.68; H, 7.44; N, 12.60. Found: C, 62.29; H, 7.40; N, 12.37.

Example 375 3-[4-Amino-2-(ethoxymethyl)-7-(piperidin-4-yloxy)-1H-imidazo[4,5-c]quinolin-1-yl]propane-1,2-diol dihydrochloride

Using the method described in Example 373, tert-butyl 4-{[4-amino-1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate (7.00 g, 12.6 mmol) was converted into 5.22 g of 3-[4-amino-2-(ethoxymethyl)-7-(piperidin-4-yloxy)-1H-imidazo[4,5-c]quinolin-1-yl]propane-1,2-diol dihydrochloride, which was isolated as a tan powder, mp 278-280° C.

MS (ESI) m/z 416.2 (M+H)⁺;

Anal. calcd for C₂₁H₂₉N₅O₄.2HCl: C, 51.64; H, 6.40; N, 14.34; Cl, 14.52. Found: C, 51.48; H, 6.38; N, 14.13; Cl, 14.49.

Examples 376-386

A reagent (0.10 mmol, 1.1 equivalents) from the table below was added to a test tube containing a solution of 3-[4-amino-7-(2-aminoethoxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]propane-1,2-diol dihydrochloride (43 mg, 0.09 mmol, prepared as described in Example 373) and N,N-diisopropylethylamine (0.051 mL, 0.29 mmol) in N,N-dimethylacetamide (1 mL). The test tubes were capped and shaken for 8 hours at room temperature and then two drops of water were added to each test tube. The solvent was removed by vacuum centrifugation. The compounds were purified by preparative high performance liquid chromatography (prep HPLC) using a Waters FractionLynx automated purification system. The prep HPLC fractions were analyzed using a Waters LC/TOF-MS, and the appropriate fractions were centrifuge evaporated to provide the trifluoroacetate salt of the desired compound. Reversed phase preparative liquid chromatography was performed with non-linear gradient elution from 5-95% B where A is 0.05% trifluoroacetic acid/water and B is 0.05% trifluoroacetic acid/acetonitrile. Fractions were collected by mass-selective triggering. The table below shows the reagent added to each test tube, the structure of the resulting compound, and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 376-386

Measured Mass Example Reagent R (M + H) 376 Methyl isocyanate

433.2225 377 Isopropyl isocyanate

461.2533 378 n-Butyl isocyanate

475.2686 379 Cyclopentyl isocyanate

487.2704 380 Phenyl isocyanate

495.2371 381 Benzyl isocyanate

509.2525 382 Benzoyl isocyanate

523.2297 383 3-Methoxy- phenyl isocyanate

525.2471 384 3-Chloro- phenyl isocyanate

529.1983 385 trans-2- Phenylcyclo- propyl isocyanate

535.2686 386 2-Morph- olinoethyl isothiocyanate

548.2625

Example 387 tert-Butyl 4-{[4-amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate

Part A

A modification on the methods described in Parts A-H of Example 2 were used to prepare 2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol, with 3-benzyloxyaniline and 3-methoxypropanoyl chloride used in lieu of 4-benzyloxyaniline and ethoxyacetyl chloride, respectively. A solution of diisopropyl azodicarboxylate (6.28 mL, 31.9 mmol) in tetrahydrofuran (25.5 mL) was added dropwise to a mixture of 2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol (7.28 g, 25.5 mmol), triphenylphosphine (8.36 g, 31.9 mmol), and t-butyl 4-hydroxypiperidine-1-carboxylate (6.42 g, 31.9 mmol) in tetrahydrofuran (191 mL) at 5° C. The mixture was allowed to warm to room temperature. After 2 days, the solvent was removed under reduced pressure and the residue was purified by flash chromatography (silica gel, gradient elution with 1.5-4% methanol in dichloromethane) to yield 9.77 g of tert-butyl 4-{[2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate as a gray amorphous solid.

Part B

A stirred solution of tert-butyl 4-{[2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate (9.77 g, 20.8 mmol) in chloroform (175 mL) at room temperature was treated with mCPBA (55% pure, 6.54 g, 20.8 mmol). After 45 minutes, concentrated ammonium hydroxide (175 mL) was added, followed by p-toluenesulfonyl chloride (3.97 g, 20.8 mmol). The mixture was stirred for 62 hours, then the layers were separated and the aqueous layer was extracted with chloroform. The combined organic layers were washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered and evaporated under reduced pressure. The crude product was purified by flash chromatography (silica gel, gradient elution with 1.5-12.5% CMA in chloroform) followed by recrystallization from acetonitrile to afford 6.3 g of tert-butyl 4-{[4-amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate as tan crystals, mp 173-175° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.89 (d, J=9.1 Hz, 1H), 7.10 (d, J=2.4 Hz, 1H), 6.93 (dd, J=9.0, 2.6 Hz, 1H), 6.39 (s, 2H), 4.70-4.61 (m, 1H), 4.46-4.41 (m, 2H), 3.81 (t, J=6.7 Hz, 2H), 3.75-3.67 (m, 2H), 3.29 (s, 3H), 3.26-3.12 (m, 4H), 2.02-1.91 (m, 2H), 1.87-1.75 (m, 2H), 1.64-1.51 (m, 2H), 1.41 (s, 9H), 0.97 (t, J=7.3 Hz, 3H);

MS (ESI) m/z 484.2923 (484.2924 calcd for C₂₆H₃₇N₅O₄, M+H⁺);

Anal. calcd for C₂₆H₃₇N₅O₄.0.75H₂O: C, 62.82; H, 7.81; N, 14.09. Found: C, 62.48; H, 8.16; N, 14.01.

Example 388 4-{[4-Amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}-N-isopropylpiperidine-1-carboxamide

Part A

tert-Butyl 4-{[4-amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate (prepared as described in Example 387, 2.11 g, 4.36 mmol) was treated with concentrated hydrochloric acid (3 mL). After vigorous bubbling, a solution formed. The solution was diluted with ethanol (50 mL) and evaporated (3×). The resulting oil was dissolved in brine (15 mL) and water (5 mL) and made basic with 50% aqueous sodium hydroxide (approximately 1.5 mL). The aqueous layer was extracted with dichloromethane (3×). The organic layers were combined, washed with water and brine, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure to provide 1.7 g of 2-(2-methoxyethyl)-7-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-ylamine as a white solid.

Part B

Isopropyl isocyanate (0.256 mL, 2.61 mmol) was added dropwise to a stirred mixture of 2-(2-methoxyethyl)-7-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-ylamine (1.00 g, 2.61 mmol) in chloroform at 0° C. The reaction mixture was allowed to warm to room temperature and was stirred for 16 hours. The solvent was evaporated under reduced pressure. The crude product was purified by flash chromatography (silica gel, gradient elution with 4-12% CMA in chloroform) followed by recrystallization from acetonitrile to afford 0.530 g of 4-{[4-amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}-N-isopropylpiperidine-1-carboxamide as white crystals, mp 176-179° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.88 (d, J=9.1 Hz, 1H), 7.08 (d, J=2.5 Hz, 1H), 6.91 (dd, J=9.0, 2.6 Hz, 1H), 6.36 (s, 2H), 6.17 (d, J=7.4 Hz, 1H), 4.66-4.56 (m, 1H), 4.47-4.37 (m, 2H), 3.80 (t, J=6.7 Hz, 2H), 3.77-3.66 (m, 3H), 3.28 (s, 3H), 3.17-3.04 (m, 4H), 2.00-1.87 (m, 2H), 1.86-1.72 (m, 2H), 1.58-1.44 (m, 2H), 1.05 (d, J=6.6 Hz, 6H), 0.96 (t, J=7.3 Hz, 3H);

MS (ESI) m/z 469.2912 (469.2927 calcd for C₂₅H₃₆N₆O₃, M+H⁺);

Anal. calcd for C₂₅H₃₆N₆O₃: C, 64.08; H, 7.74; N, 17.93. Found: C, 63.73; H, 7.73; N, 17.76.

Example 389 7-[(1-Isobutyrylpiperidin-4-yl)oxy]-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Isobutyryl chloride (0.273 mL, 2.61 mmol) was added dropwise to a stirred solution of 2-(2-methoxyethyl)-7-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-ylamine (prepared as described in Part A of Example 388, 1.00 g, 2.61 mmol) in chloroform at 0° C. After 2 hours, the solution was allowed to warm to ambient temperature for 1 hour. Saturated aqueous sodium carbonate (15 mL) and water (10 mL) were added and the mixture was allowed to stir for 16 hours. The mixture was transferred to a separatory funnel, the layers were separated, and the aqueous layer was extracted with dichloromethane (2×30 mL). The organic layers were combined, washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. Recrystallization from acetonitrile afforded 1.00 g of 7-[(1-isobutyrylpiperidin-4-yl)oxy]-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as a flocculent white solid, mp 165-166° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.88 (d, J=9.1 Hz, 1H), 7.11 (d, J=2.6 Hz, 1H), 6.92 (dd, J=9.0, 2.6 Hz, 1H), 6.37 (s, 2H), 4.75-4.65 (m, 1H), 4.47-4.37 (m, 2H), 3.98-3.85 (m, 1H), 3.85-3.77 (m, 1H), 3.80 (t, J=6.8 Hz, 2H), 3.47-3.34 (m, 1H), 3.28 (s, 3H), 3.30-3.19 (m, 1H), 3.15 (t, J=6.8 Hz, 2H), 2.94-2.84 (m, 1H), 2.06-1.89 (m, 2H), 1.86-1.72 (m, 2H), 1.69-1.46 (m, 2H), 1.00 (d, J=6.7 Hz, 6H), 0.96 (t, J=7.4 Hz, 3H);

MS (ESI) m/z 454.2810 (454.2818 calcd for C₂₅H₃₅N₅O₃, M+H⁺);

Anal. calcd for C₂₅H₃₃N₅O₃: C, 66.20; H, 7.78; N, 15.44. Found: C, 65.95; H, 8.09; N, 15.43.

Example 390 2-(2-Methoxyethyl)-7-{[1-(methylsulfonyl)piperidin-4-yl]oxy}-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Using the method described in Example 389, 2-(2-methoxyethyl)-7-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-ylamine (1.00 g, 2.61 mmol) was converted into 2-(2-methoxyethyl)-7-{[1-(methylsulfonyl)piperidin-4-yl]oxy}-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine, using methanesulfonyl chloride (0.202 mL, 2.61 mmol) in lieu of isobutyryl chloride. The crude product was purified by flash chromatography (silica gel, eluting with a step gradient of CMA in chloroform (4-12% CMA increasing by 2% CMA every 500 mL) followed by trituration with acetonitrile to afford 1.1 g of 2-(2-methoxyethyl)-7-{[1-(methylsulfonyl)piperidin-4-yl]oxy}-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as a white solid, mp 224-225.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.90 (d, J=9.0 Hz, 1H), 7.12 (d, J=2.6 Hz, 1H), 6.95 (dd, J=9.0, 2.6 Hz, 1H), 6.39 (s, 2H), 4.70-4.62 (m, 1H), 4.46-4.41 (m, 2H), 3.81 (t, J=6.7 Hz, 2H), 3.44-3.34 (m, 2H), 3.29 (s, 3H), 3.19-3.12 (m, 4H), 2.92 (s, 3H), 2.12-2.00 (m, 2H), 1.87-1.73 (m, 4H), 0.97 (t, J=7.4 Hz, 3H);

MS (ESI) m/z 462.2184 (462.2175 calcd for C₂₂H₃₁N₅O₄S, M+H⁺);

Anal. calcd for C₂₂H₃₁N₅O₄S.0.10CH₂Cl₂: C, 56.47; H, 6.69; N, 14.90; S, 6.82. Found: C, 56.36; H, 6.93; N, 14.80; S, 6.96.

Example 391 4-{[4-Amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxamide

Trimethylsilylisocyanate (0.225 mL, 1.67 mmol) was added dropwise to a slurry of 2-(2-methoxyethyl)-7-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-ylamine (prepared as described in Part A of Example 388, 0.640 g, 1.67 mmol) in chloroform (16 mL) at 0° C. The reaction mixture was stirred for 40 minutes and water (10 mL) was added. The reaction mixture was stirred vigorously for 2 hours, diluted with 200 mL ethanol, and then concentrated under reduced pressure to approximately 100 mL. Another 100 mL ethanol was added and the solution was evaporated to afford a white solid that was recrystallized from ethanol to provide 0.625 g of 4-{[4-amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxamide as granular off-white crystals, mp 207-208.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.88 (d, J=9.0 Hz, 1H), 7.09 (d, J=2.5 Hz, 1H), 6.92 (dd, J=9.0, 2.5 Hz, 1H), 6.37 (s, 2H), 5.94 (s, 2H), 4.66-4.58 (m, 1H), 4.44-4.39 (m, 2H), 3.80 (t, J=6.7 Hz, 2H), 3.75-3.63 (m, 2H), 3.28 (s, 3H), 3.17-3.04 (m, 4H), 1.99-1.87 (m, 2H), 1.86-1.71 (m, 2H), 1.60-1.44 (m, 2H), 0.96 (t, J=7.3 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 158.0, 155.5, 151.9, 149.8, 146.5, 132.6, 125.1, 121.1, 112.5, 109.9, 109.0, 72.2, 70.2, 58.1, 46.1, 40.9, 30.6, 27.1, 23.0, 10.6;

MS (ESI) m/z 427.2443 (427.2458 calcd for C₂₂H₃₀N₆O₃, M+H⁺);

Anal. calcd for C₂₂H₃₀N₆O₃.0.50H₂O: C, 60.67; H, 7.17; N, 19.30. Found: C, 61.03; H, 7.60; N, 19.61.

Example 392 2-(2-Methoxyethyl)-7-[3-(methylsulfonyl)propoxy]-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Part A

A modification on the methods described in Parts A-H of Example 2 were used to prepare 2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol, with 3-benzyloxyaniline and 3-methoxypropanoyl chloride used in lieu of 4-benzyloxyaniline and ethoxyacetyl chloride, respectively. Diisopropyl azodicarboxylate (2.07 mL, 10.5 mmol) was added dropwise to a slurry of 2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol (2.00 g, 7.01 mmol), triphenylphosphine (2.75 g, 10.5 mmol), and 3-(methylthio)propan-1-ol (1.08 mL, 10.5 mmol) in tetrahydrofuran (70 mL) at 0° C. The solution was stirred for 30 minutes at 0° C., then at room temperature for 16 hours. The solvent was removed under reduced pressure and the residue was dissolved in ethyl acetate, treated with 1 M hydrochloric acid (40 mL), and stirred for 30 minutes. The layers were separated and the aqueous layer was extracted with ethyl acetate (2×25 mL). The aqueous layer was adjusted to approximately pH 14 with 50% aqueous sodium hydroxide and then was extracted with dichloromethane (3×50 mL). The organic layers were combined, washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by flash chromatography (silica gel, gradient elution with 1-4% methanol in dichloromethane) to provide 2.0 g of 2-(2-methoxyethyl)-7-[3-(methylthio)propoxy]-1-propyl-1H-imidazo[4,5-c]quinoline as an opaque solid.

Part B

3-Chloroperoxybenzoic acid (4.63 g, 16.1 mmol) was added to a solution of 2-(2-methoxyethyl)-7-[3-(methylthio)propoxy]-1-propyl-1H-imidazo[4,5-c]quinoline (2.0 g, 5.35 mmol) in chloroform (45 mL). After 1 hour, concentrated ammonium hydroxide (45 mL) was added and the mixture was stirred for 30 minutes. p-Toluenesulfonyl chloride (1.07 g, 5.62 mmol) was added in two portions. After the mixture was allowed to stir for 16 hours, the layers were separated and the aqueous layer was extracted with dichloromethane. The combined organic layers were washed with 14% aqueous ammonium hydroxide, water, and brine. The organic layer was dried over anhydrous sodium sulfate, filtered, and evaporated. The resulting oil was crystallized from hot acetonitrile to afford a tan solid that was isolated by filtration. The solid was subjected to flash column chromatography (silica gel, gradient elution with 2-14% CMA in chloroform) followed by recrystallization from acetonitrile to yield 0.510 g of 2-(2-methoxyethyl)-7-[3-(methylsulfonyl)propoxy]-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as red-violet crystals, mp 170-171° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.91 (d, J=9.0 Hz, 1H), 7.07 (d, J=2.6 Hz, 1H), 6.92 (dd, J=9.0, 2.6 Hz, 1H), 6.40 (s, 2H), 4.46-4.41 (m, 2H), 4.18 (t, J=6.2 Hz, 2H), 3.81 (t, J=6.7 Hz, 2H), 3.34-3.29 (m, 2H), 3.29 (s, 3H), 3.16 (t, J=6.8 Hz, 2H), 3.03 (s, 3H), 2.27-2.14 (m, 2H), 1.87-1.75 (m, 2H), 0.97 (t, J=7.4 Hz, 3H);

MS (ESI) m/z 421.1903 (421.1910 calcd for C₂₀H₂₈N₄O₄S, M+H⁺);

Anal. calcd for C₂₀H₂₈N₄O₄S: C, 57.12; H, 6.71; N, 13.32; S, 7.62. Found: C, 57.16; H, 6.70; N, 13.46; S, 7.74.

Example 393 tert-Butyl 3-{[4-amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propylcarbamate

Part A

A modification on the methods described in Parts A-H of Example 2 were used to prepare 2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol, with 3-benzyloxyaniline and 3-methoxypropanoyl chloride used in lieu of 4-benzyloxyaniline and ethoxyacetyl chloride, respectively. 2-(2-Methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol (20.0 g, 70 mmol) was converted into tert-butyl {3-[2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy]propyl}carbamate using a modification of the method described in Part C of Example 7. The reaction was worked up by removing the solvent under reduced pressure. The residue was partitioned between ethyl acetate and water. The aqueous layer was extracted with ethyl acetate. The organic layers were combined, washed with water (2×500 mL) and brine, dried over anhydrous magnesium sulfate, filtered, and evaporated under reduced pressure to yield tert-butyl {3-[2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yloxy]propyl}carbamate as a brown oil, which was used without further purification.

Part B

The material from Part A was dissolved in chloroform (700 mL) and treated with mCPBA (60% pure, 21.96 g, 75 mmol). After 1 hour, the reaction mixture was poured into 2% aqueous sodium carbonate. The layers were separated and the organic layer was washed with water and saturated aqueous sodium chloride. The organic layer was dried over anhydrous magnesium sulfate, filtered and evaporated. The crude product was purified by flash chromatography (silica gel, gradient elution with 2-7% methanol in dichloromethane) to afford 19.3 g of tert-butyl 3-{[2-(2-methoxyethyl)-5-oxido-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propylcarbamate as a tan foam.

Part C

p-Toluenesulfonyl chloride (8.0 g, 42 mmol) was added over ten minutes to a stirred mixture of tert-butyl 3-{[2-(2-methoxyethyl)-5-oxido-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propylcarbamate (19.3 g, 42.0 mmol) in dichloromethane (300 mL) and concentrated ammonium hydroxide (300 mL) at 7° C. The mixture was allowed to stir for 20 minutes, then the cooling bath was removed and the mixture was allowed to stir at ambient temperature for 2 hours. The layers were separated and the aqueous layer was extracted with dichloromethane. The organic layers were combined, washed with water and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, filtered, and evaporated under reduced pressure. Recrystallization from acetonitrile afforded 12.0 g of tert-butyl 3-{[4-amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propylcarbamate as flocculent white crystals, mp 133.5-135° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.89 (d, J=9.0 Hz, 1H), 7.05 (d, J=2.7 Hz, 1H), 6.95-6.87 (m, 1H), 6.89 (dd, J=9.0, 2.7 Hz, 1H), 6.37 (s, 2H), 4.46-4.41 (m, 2H), 4.05 (t, J=6.2 Hz, 2H), 3.81 (t, J=6.8 Hz, 2H), 3.29 (s, 3H), 3.18-3.08 (m, 4H), 1.91-1.74 (m, 4H), 1.38 (s, 9H), 0.97 (t, J=7.3 Hz, 3H);

MS (ESI) m/z 458.2758 (458.2767 calcd for C₂₄H₃₅N₅O₄, M+H⁺);

Anal. calcd for C₂₄H₃₅N₅O₄.0.73H₂O: C, 61.24; H, 7.81; N, 14.88. Found: C, 61.23; H, 7.62; N, 14.78.

Example 394 7-(3-Aminopropoxy)-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Concentrated hydrochloric acid (8.5 mL) was added to a solution of tert-butyl 3-{[4-amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propylcarbamate (prepared as described in Example 393, 12 g, 26 mmol) in ethanol (300 mL). The solution was heated at reflux for 4 hours. Upon cooling to ambient temperature a precipitate formed. The solid was isolated by filtration and the filtrate was evaporated to afford a white solid. The solids were combined and dissolved in water (40 mL). The solution was adjusted to approximately pH 12 with 50% aqueous sodium hydroxide and then was extracted with dichloromethane (4×250 mL). The organic layers were combined, washed with water and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, filtered, and evaporated to yield a solid that was purified by trituration in hot acetonitrile to provide 6.5 g of 7-(3-aminopropoxy)-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as yellow crystals, mp 165-166.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.88 (d, J=9.0 Hz, 1H), 7.06 (d, J=2.6 Hz, 1H), 6.89 (dd, J=9.1, 2.6 Hz, 1H), 6.37 (s, 2H), 4.46-4.41 (m, 2H), 4.10 (t, J=6.4 Hz, 2H), 3.81 (t, J=6.7 Hz, 2H), 3.29 (s, 3H), 3.16 (t, J=6.7 Hz, 2H), 2.72 (t, J=6.7 Hz, 2H), 1.87-1.74 (m, 4H), 1.47 (br s, 2H), 0.97 (t, J=7.4 Hz, 3H);

MS (ESI) m/z 358.2231 (358.2243 calcd for C₁₉H₂₇N₅O₂, M+H⁺);

Anal. calcd for C₁₉H₂₇N₅O₂: C, 63.84; H, 7.61; N, 19.59. Found: C, 63.50; H, 7.75; N, 19.46.

Example 395 N-(3-{[4-Amino-2-(2-hydroxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)-2-methylpropanamide

Part A

Isobutyryl chloride (0.375 mL, 3.58 mmol) was added dropwise to a slurry of 7-(3-aminopropoxy)-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (prepared as described in Example 394, 1.28 g, 3.58 mmol) in dichloromethane (22 mL) at 0° C. The reaction mixture was allowed to stir for 30 minutes at 0° C., then the reaction mixture was allowed to stir for 16 hours at ambient temperature. Saturated aqueous sodium carbonate was added and the reaction mixture was stirred for 1 hour, resulting in the formation of a flocculent solid. The solid was isolated by filtration and dissolved in dichloromethane. The dichloromethane was washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The resulting white solid was recrystallized from acetonitrile to afford 1.14 g of N-(3-{[4-amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)-2-methylpropanamide as an off-white solid.

Part B

A 1.0 M solution of boron tribromide in dichloromethane (2.55 mL, 2.55 mmol) was added over 1 minute to a slurry of N-(3-{[4-amino-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)-2-methylpropanamide (1.09 g, 2.55 mmol) at 0° C. The clumpy slurry was allowed to stir for 15 minutes at 0° C., then was allowed to stir for another hour at ambient temperature. Additional boron tribromide solution (0.6 mL, 0.6 mmol) was added. After 16 hours, the reaction was quenched with 6 M hydrochloric acid (10 mL), stirred until all the solids dissolved, and the dichloromethane was removed under reduced pressure. The aqueous layer was adjusted to approximately pH 13 with 50% aqueous sodium hydroxide and was extracted with ethyl acetate. The organic layer was washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and evaporated. The material was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 2-22% CMA in chloroform) followed by trituration with acetonitrile to afford 0.325 g of N-(3-{[4-amino-2-(2-hydroxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)-2-methylpropanamide as a white solid, mp 190.5-192° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.89 (d, J=9.1 Hz, 1H), 7.81 (t, J=5.5 Hz, 1H), 7.05 (d, J=2.6 Hz, 1H), 6.90 (dd, J=9.0, 2.6 Hz, 1H), 6.43 (s, 2H), 4.88 (t, J=5.5 Hz, 1H), 4.47-4.42 (m, 2H), 4.06 (t, J=6.3 Hz, 2H), 3.90-3.84 (m, 2H), 3.26-3.20 (m, 2H), 3.06 (t, J=6.6 Hz, 2H), 2.42-2.28 (m, 1H), 1.93-1.75 (m, 4H), 1.00 (d, J=6.9 Hz, 6H), 0.98 (t, J=7.3 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 176.0, 157.2, 151.9, 150.5, 146.5, 132.6, 125.0, 120.9, 111.6, 108.9, 108.1, 65.1, 59.6, 46.0, 35.4, 34.0, 30.2, 28.9, 22.9, 19.5, 10.6;

MS (ESI) m/z 414.3 (M+H)⁺;

Anal. calcd for C₂₂H₃₁N₅O₃: C, 63.90; H, 7.56; N, 16.94. Found: C, 63.76; H, 7.78; N, 16.92.

Example 396 N-(3-{[4-Amino-2-(2-hydroxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)nicotinamide

Using the procedures described in Parts A and B of Example 395, with nicotinoyl chloride hydrochloride (0.627 g, 3.52 mmol) used in lieu of isobutyryl chloride, 7-(3-aminopropoxy)-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (prepared as described in Example 394, 1.28 g, 3.58 mmol) was converted into 0.230 g of N-(3-{[4-amino-2-(2-hydroxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)nicotinamide after recrystallization from acetonitrile to yield pale yellow needles, mp 183.5-184.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 9.02 (dd, J=2.4, 0.7 Hz, 1H), 8.77 (t, J=5.4 Hz, 1H), 8.70 (dd, J=4.7, 1.7 Hz, 1H), 8.21-8.17 (m, 1H), 7.90 (d, J=9.1 Hz, 1H), 7.52-7.48 (m, 1H), 7.08 (d, J=2.6 Hz, 1H), 6.91 (dd, J=9.0, 2.6 Hz, 1H), 6.41 (s, 2H), 4.88 (t, J=5.6 Hz, 1H), 4.47-4.42 (m, 2H), 4.14 (t, J=6.2 Hz, 2H), 3.90-3.84 (m, 2H), 3.52-3.46 (m, 2H), 3.06 (t, J=6.6 Hz, 2H), 2.09-2.00 (m, 2H), 1.88-1.75 (m, 2H), 0.98 (t, J=7.3 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 157.2, 151.9, 151.7, 150.5, 148.3, 146.5, 134.8, 132.6, 130.0, 125.0, 123.3, 120.9, 111.6, 108.9, 108.2, 65.2, 59.6, 46.0, 36.4, 30.2, 28.8, 22.9, 10.6;

MS (ESI) m/z 449.3 (M+H)⁺;

Anal. calcd for C₂₄H₂₈N₆O₃: C, 64.27; H, 6.29; N, 18.74. Found: C, 63.99; H, 6.53; N, 18.87.

Example 397 tert-Butyl 4-{4-amino-2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butylcarbamate

Part A

Using a modification on the procedure described in Part E of Example 2, tert-butyl 4-{[7-(benzyloxy)-3-nitroquinolin-4-yl]amino}butylcarbamate was synthesized using 7-benzyloxy-3-nitroquinolin-4-ol (prepared as described in Steps A-C of Example 1) and tert-butyl 4-aminobutylcarbamate in lieu of the 6-benzyloxy-3-nitroquinolin-4-ol and propylamine, respectively.

Part B

A mixture of tert-butyl 4-{[7-(benzyloxy)-3-nitroquinolin-4-yl]amino}butylcarbamate (30.0 g, 64.3 mmol) and 5% platinum on carbon (3.0 g) in toluene (675 mL) and 2-propanol (100 mL) was hydrogenated on a Parr apparatus for 12.5 hours at 24 psi (1.7×10⁵ Pa). The mixture was filtered through CELITE filter agent, which was rinsed afterwards with 1:1 toluene/2-propanol and 2-propanol. The combined filtrates were concentrated under reduced pressure to afford 28 g of tert-butyl 4-{[3-amino-7-(benzyloxy)quinolin-4-yl]amino}butylcarbamate as a viscous black oil that was used in the next step without purification.

Part C

Ethoxyacetyl chloride (7.87 mL, 64.3 mmol) was added dropwise to a stirred solution of the material from Part B in dichloromethane (319 mL). After 1 hour, the solution was concentrated under reduced pressure. The residue was dissolved in ethanol (319 mL) and triethylamine (35.84 mL, 257 mmol) and the solution was heated at reflux for 4 hours, then was allowed to cool to room temperature and was concentrated under reduced pressure. The residue was dissolved in dichloromethane and washed with water and saturated aqueous sodium chloride. The organic layer was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The resulting semi-solid was dissolved in hot acetonitrile and allowed to cool. Evaporation of the acetonitrile under reduced pressure afforded 30 g of tert-butyl 4-[7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]butylcarbamate as a chunky brown solid.

Part D

A mixture of tert-butyl 4-[7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]butylcarbamate (15 g, 29.7 mmol) and 10% palladium on carbon (4.5 g, wetted with ethanol) in 1:1 ethanol/methanol (400 mL) was hydrogenated using a Parr apparatus at 28 psi (1.9×10⁵ Pa) for 16 hours. The mixture was filtered through CELITE filter agent, which was subsequently washed with methanol. The filtrate was concentrated under reduced pressure to afforded 10.8 g of tert-butyl 4-[2-(ethoxymethyl)-7-hydroxy-1H-imidazo[4,5-c]quinolin-1-yl]butylcarbamate as a green-yellow solid.

Part E

Using the conditions described in Part A of Example 392, tert-butyl 4-[2-(ethoxymethyl)-7-hydroxy-1H-imidazo[4,5-c]quinolin-1-yl]butylcarbamate (3.50 g, 8.44 mmol) was converted into tert-butyl 4-{2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butylcarbamate using 1-(3-hydroxypropyl)pyrrolidin-2-one (1.64 mL, 12.7 mmol) in lieu of 3-(methylthio)propan-1-ol. The reaction was worked up by removing the solvent under reduced pressure. The residue was subjected to flash chromatography (silica gel, elution with ethyl acetate followed by gradient elution with 1-5% methanol in dichloromethane) to yield 3.79 g of tert-butyl 4-{2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butylcarbamate as a viscous yellow oil.

Part F

Using a modification on the procedure described in Part B of Example 392, tert-butyl 4-{2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butylcarbamate (3.79 g, 7.02 mmol) was converted into tert-butyl 4-{4-amino-2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butylcarbamate. After the p-toluenesulfonyl chloride was added, the mixture was allowed to stir for 72 hours. The layers were separated and the aqueous layer was extracted with dichloromethane. The organic layers were combined, washed with 5% aqueous sodium bicarbonate, water, and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and evaporated. Recrystallization from acetonitrile afforded 3.1 g of tert-butyl 4-{4-amino-2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butylcarbamate as a white solid, mp 134.5-136° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.90 (d, J=9.0 Hz, 1H), 7.04 (d, J=2.5 Hz, 1H), 6.90 (dd, J=8.8, 2.3 Hz, 1H), 6.81 (t, J=5.0 Hz, 1H), 6.51 (s, 2H), 4.74 (s, 2H), 4.52-4.47 (m, 2H), 4.04 (t, J=6.2 Hz, 2H), 3.55 (q, J=7.0 Hz, 2H), 3.42-3.34 (m, 4H), 2.99-2.93 (m, 2H), 2.22 (t, J=8.0 Hz, 2H), 2.00-1.88 (m, 4H), 1.87-1.74 (m, 2H), 1.61-1.50 (m, 2H), 1.33 (s, 9H), 1.16 (t, J=7.0 Hz, 3H);

MS (ESI) m/z 555.3287 (555.3295 calcd for C₂₉H₄₂N₆O₅, M+H⁺);

Anal. calcd for C₂₉H₄₂N₆O₅.1.25H₂O: C, 60.35; H, 7.77; N, 14.56. Found: C, 60.35; H, 7.83; N, 14.12.

Example 398 1-(3-{[4-Amino-1-(4-aminobutyl)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)pyrrolidin-2-one dihydrochloride

A solution of tert-butyl 4-{4-amino-2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butylcarbamate (prepared as described in Example 397, 2.90 g, 5.23 mmol) in 4 M ethanolic hydrogen chloride was heated at reflux for 2 hours. The solution was allowed to cool to room temperature and a precipitate formed that was isolated by filtration to afford 2.52 g of 1-(3-{[4-amino-1-(4-aminobutyl)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)pyrrolidin-2-one dihydrochloride as a white powder, mp>250° C. ¹H NMR (300 MHz, DMSO-d₆) δ 13.92 (s, 1H), 9.30-8.40 (br s, 2H), 8.15 (d, J=9.2 Hz, 1H), 8.13-8.00 (m, 3H), 7.30 (d, J=2.5 Hz, 1H), 7.20 (dd, J=9.1, 2.4 Hz, 1H), 4.83 (s, 2H), 4.65-4.60 (m, 2H), 4.10 (t, J=6.1 Hz, 2H), 3.60 (q, J=7.0 Hz, 2H), 3.41-3.37 (m, 4H), 2.87-2.76 (m, 2H), 2.22 (t, J=8.0 Hz, 2H), 2.04-1.85 (m, 6H), 1.81-1.70 (m, 2H), 1.19 (t, J=7.0 Hz, 3H);

MS (ESI) m/z 455.2784 (455.2771 calcd for C₂₄H₃₄N₆O₃, M+H⁺);

Anal. calcd for C₂₄H₃₄N₆O₃.1.60H₂O.2.15HCl: C, 51.28; H, 7.06; N, 14.95; Cl, 13.59.

Found: C, 51.29; H, 7.36; N, 14.93; Cl, 13.48.

Example 399 N-(4-{4-Amino-2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butyl)-N′-isopropylurea

Isopropyl isocyanate (0.187 mL, 1.90 mmol) was added dropwise to a stirred solution of 1-(3-{[4-amino-1-(4-aminobutyl)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)pyrrolidin-2-one dihydrochloride (prepared as described in Example 398, 1.0 g, 1.90 mmol) and triethylamine (0.530 mL, 3.80 mmol) in dichloromethane (20 mL) at room temperature. After 1.5 hours, the solvent was removed under reduced pressure and the residue was purified by flash chromatography (silica gel, gradient elution with 2-12% CMA in chloroform) followed by recrystallization from acetonitrile to yield 0.730 g of N-(4-{4-amino-2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butyl)-N′-isopropylurea as an opaque solid, mp 98-101° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.90 (d, J=9.0 Hz, 1H), 7.05 (d, J=2.6 Hz, 1H), 6.91 (dd, J=9.0, 2.6 Hz, 1H), 6.55 (s, 2H), 5.69 (t, J=5.7 Hz, 1H), 5.57 (d, J=7.7 Hz, 1H), 4.74 (s, 2H), 4.53-4.48 (m, 2H), 4.04 (t, J=6.3 Hz, 2H), 3.69-3.58 (m, 1H), 3.55 (q, J=7.0 Hz, 2H), 3.40-3.34 (m, 4H), 3.03 (q, J=6.3 Hz, 2H), 2.22 (t, J=8.0 Hz, 2H), 2.00-1.88 (m, 4H), 1.88-1.76 (m, 2H), 1.58-1.48 (m, 2H), 1.16 (t, J=7.0 Hz, 3H), 0.98 (d, J=6.5 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 173.9, 157.5, 157.4, 152.2, 148.0, 146.8, 133.4, 124.8, 121.4, 111.7, 108.7, 108.0, 65.3, 64.2, 46.5, 45.1, 40.8, 39.1, 30.4, 27.3, 26.7, 23.2, 17.5, 14.9;

MS (ESI) m/z 540.3315 (540.3298 calcd for C₂₈H₄₁N₇O₄, M+H⁺);

Anal. calcd for C₂₈H₄₁N₇O₄: C, 62.32; H, 7.66; N, 18.17. Found: C, 61.95; H, 7.90; N, 18.46.

Example 400 N-(4-{4-Amino-2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butyl)methanesulfonamide

Using the procedure described in Example 399, 1-(3-{[4-amino-1-(4-aminobutyl)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)pyrrolidin-2-one dihydrochloride (prepared as described in Example 398, 1.0 g, 1.90 mmol) was converted into N-(4-{4-amino-2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butyl)methanesulfonamide using methanesulfonyl chloride (0.147 mL, 1.90 mmol) in lieu of isopropyl isocyanate. Recrystallization from acetonitrile afforded 0.246 g of N-(4-{4-amino-2-(ethoxymethyl)-7-[3-(2-oxopyrrolidin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-1-yl}butyl)methanesulfonamide as white crystals, mp 157° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.96 (d, J=9.0 Hz, 1H), 7.06 (d, J=2.6 Hz, 1H), 6.99 (dd, J=9.0, 2.6 Hz, 1H), 6.93 (dd, J=9.0, 2.6 Hz, 1H), 6.65 (s, 2H), 4.75 (s, 2H), 4.55-4.50 (m, 2H), 4.04 (t, J=6.2 Hz, 2H), 3.56 (q, J=7.0 Hz, 2H), 3.40-3.34 (m, 4H), 2.99 (q, J=6.3 Hz, 2H), 2.87 (s, 3H), 2.22 (t, J=8.0 Hz, 2H), 2.00-1.83 (m, 6H), 1.69-1.59 (m, 2H), 1.17 (t, J=7.0 Hz, 3H);

MS (ESI) m/z 533.2565 (533.2546 calcd for C₂₅H₃₆N₆O₅S, M+H⁺);

Anal. calcd for C₂₅H₃₆N₆O₅S: C, 56.37; H, 6.81; N, 15.78; S, 6.02. Found: C, 56.08; H, 6.74; N, 15.47; S, 6.31.

Example 401 1-[4-(1,1-Dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinolin-4-amine

Part A

A solution of tert-butyl 4-[7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]butylcarbamate (prepared as described in Parts A-C of Example 397, 21.0 g, 41.6 mmol) and concentrated hydrochloric acid (13 mL) in ethanol (100 mL) was heated at reflux for 1 hour. The solution was allowed to cool to room temperature and a precipitate formed that was isolated by filtration to yield 12.10 g of 4-[7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]butan-1-amine dihydrochloride as a light brown solid.

Part B

3-Chloropropanesulfonyl chloride (4.58 mL, 37.7 mmol) was added dropwise to a solution of 4-[7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]butan-1-amine dihydrochloride (12.1 g, 25.3 mmol) and triethylamine (14.0 mL, 101 mmol) in dichloromethane (168 mL) at room temperature. The solution was stirred for 17 hours, then transferred to a separatory funnel and washed with 5% aqueous sodium carbonate, water, and saturated aqueous sodium chloride. The organic layer was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The residue was dissolved in DMF (168 mL) and treated with 1,8-diazabicyclo[5.4.0]undec-7-ene (5.70 mL, 38 mmol). The solution was stirred for 40 hours, then the DMF was removed under reduced pressure. The residue was dissolved in dichloromethane and washed repeatedly with water then saturated aqueous sodium carbonate. The organic layer was dried over anhydrous sodium sulfate, filtered, and evaporated to afford 7-(benzyloxy)-1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinoline in almost quantitative yield with some residual 1,8-diazabicyclo[5.4.0]undec-7-ene as a brown oil, which was used without further purification.

Part C

A mixture of 7-(benzyloxy)-1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinoline (4.6 g, 9.04 mmol) and palladium hydroxide (1.5 g) in acetonitrile (50 mL) and methanol (75 mL) was hydrogenated on a Parr apparatus at 50 psi (3.5×10⁵ Pa) for 28 hours. The mixture was filtered through CELITE filter agent, which was rinsed afterwards with 40% methanol in acetonitrile (600 mL). The filtrates were combined and concentrated under reduced pressure to yield a yellow solid that was triturated with acetonitrile and isolated by filtration to afford 2.2 g of 1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-ol as a pale yellow powder.

Part D

Using a modification of the method described in Part A of Example 392, 1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-ol (1.1 g, 2.63 mmol) was converted into 1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinoline, using 3-hydroxytetrahydrofuran (0.320 mL, 3.94 mmol) in lieu of 3-(methylthio)propan-1-ol. The reaction mixture was allowed to stir at ambient temperature for 72 hours, then was treated with 3 M hydrochloric acid (30 mL) and extracted with ethyl acetate. The aqueous layer was adjusted to a basic pH with saturated aqueous sodium carbonate and was extracted with dichloromethane. The organic layer was washed with water and saturated sodium chloride, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure to afford 1.0 g of 1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinoline as a yellow waxy solid.

Part E

Using a modification of the method described in Part B of Example 392, 1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinoline (1.0 g, 2.05 mmol) was converted into 1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinolin-4-amine. In the workup, the layers were separated and the aqueous was extracted with chloroform. The combined organic layers were washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and evaporated under reduced pressure. The crude product was recrystallized from acetonitrile to 0.511 g of 1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-7-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinolin-4-amine as red-tan crystals, mp 195.5-197° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.95 (d, J=9.0 Hz, 1H), 7.02 (d, J=2.6 Hz, 1H), 6.90 (dd, J=9.0, 2.6 Hz, 1H), 6.57 (s, 2H), 5.17-5.10 (m, 1H), 4.75 (s, 2H), 4.58-4.48 (m, 2H), 3.97-3.74 (m, 4H), 3.55 (q, J=7.0 Hz, 2H), 3.19-3.13 (m, 4H), 2.93 (t, J=6.6 Hz, 2H), 2.33-2.14 (m, 3H), 2.08-1.99 (m, 1H), 1.92-1.82 (m, 2H), 1.76-1.66 (m, 2H), 1.16 (t, J=7.0 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 156.1, 152.3, 148.1, 146.9, 133.3, 124.9, 121.7, 112.2, 109.0, 108.8, 77.0, 72.3, 66.5, 65.3, 64.2, 46.5, 46.1, 45.0, 43.7, 32.5, 27.1, 24.3, 18.3, 14.9;

MS (ESI) m/z 504.2276 (504.2281 calcd for C₂₄H₃₃N₅O₅S, M+H⁺);

Anal. calcd for C₂₄H₃₃N₅O₅S: C, 57.24; H, 6.60; N, 13.91; S, 6.37. Found: C, 56.91; H, 6.47; N, 13.73; S, 6.50.

Example 402 1-(3-{[4-Amino-1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)pyrrolidin-2-one

Using a modification of the procedures described in Parts D and E of Example 401, 1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-ol (prepared as described in Steps A-C of Example 401, 1.1 g, 2.63 mmol) was converted into 1-(3-{[4-amino-1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)pyrrolidin-2-one, using 1-(3-hydroxypropyl)pyrrolidin-2-one in lieu of 3-hydroxytetrahydrofuran in step D. Purification by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 1-20% CMA in chloroform) followed by trituration with acetonitrile and isolation by filtration afforded 0.551 g of 1-(3-{[4-amino-1-[4-(1,1-dioxidoisothiazolidin-2-yl)butyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}propyl)pyrrolidin-2-one as a white solid, mp 142-144° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.94 (d, J=9.0 Hz, 1H), 7.05 (d, J=2.6 Hz, 1H), 6.91 (dd, J=8.9, 2.6 Hz, 1H), 6.52 (s, 2H), 4.75 (s, 2H), 4.55-4.50 (m, 2H), 4.04 (t, J=6.2 Hz, 2H), 3.55 (q, J=7.0 Hz, 2H), 3.40-3.34 (m, 4H), 3.18-3.13 (m, 4H), 2.94 (t, J=6.6 Hz, 2H), 2.24-2.14 (m, 4H), 2.00-1.82 (m, 6H), 1.76-1.66 (m, 2H), 1.16 (t, J=7.0 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 173.9, 157.5, 152.3, 148.0, 147.0, 133.3, 124.8, 121.4, 111.7, 108.7, 108.0, 65.3, 65.3, 64.1, 46.5, 46.1, 44.9, 43.7, 39.1, 30.4, 27.1, 26.7, 24.3, 18.3, 17.5, 14.9;

MS (ESI) m/z 559.2718 (559.2703 calcd for C₂₇H₃₈N₆O₅S, M+H⁺);

Anal. calcd for C₂₇H₃₈N₆O₅S: C, 58.05; H, 6.86; N, 15.04. Found: C, 57.95; H, 7.22; N, 15.15.

Example 403 4-{2-[(4-Amino-1-isobutyl-2-methyl-1H-imidazo[4,5-c]quinolin-7-yl)oxy]ethyl}-N-cyclohexylpiperidine-1-carboxamide

The preparation of 2-methyl-1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine is described in Example 24. Cyclohexyl isocyanate (0.100 mL, 0.786 mmol) was added dropwise to a stirred solution of 2-methyl-1-(2-methylpropyl)-7-(2-piperidin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-4-amine (0.300 g, 0.786 mmol) in dichloromethane (10 mL) at 0° C. After 30 minutes, the solution was concentrated under reduced pressure and the resulting residue was purified by flash chromatography (silica gel, sequential elution with 2% and 5% methanol in dichloromethane) followed by recrystallization from ethanol to afford 0.141 g of 4-{2-[(4-amino-1-isobutyl-2-methyl-1H-imidazo[4,5-c]quinolin-7-yl)oxy]ethyl}-N-cyclohexylpiperidine-1-carboxamide as a white powder, mp 213.7-215.7° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.85 (d, J=9.5 Hz, 1H), 7.05 (d, J=3.0 Hz, 1H), 6.89 (dd, J=8.6, 2.5 Hz, 1H), 6.43 (s, 2H), 6.06 (d, J=7.6 Hz, 1H), 4.27 (d, J=7.5 Hz, 2H), 4.09 (t, J=6.0 Hz, 2H), 4.0-3.92 (m, 2H), 3.44-3.30 (m, 1H), 2.64-2.56 (m, 2H), 2.56 (s, 3H), 2.23-2.09 (m, 1H), 1.77-1.50 (m, 10H), 1.3-0.96 (m, 7H), 0.93 (d, J=6.7 Hz, 6H);

MS (ESI) m/z 507.3465 (507.3448 calcd for C₂₉H₄₂N₆O₂, M+H⁺);

Anal. calcd for C₂₉H₄₂N₆O₂.0.5H₂O: C, 67.54; H, 8.41; N, 16.30. Found: C, 67.78; H, 8.43; N, 16.46.

Example 404 tert-Butyl 4-({[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}acetyl)piperazine-1-carboxylate

Part A

Di-tert-butyl dicarbonate (19.05 g, 0.087 mol) in dichloromethane (218 mL) was added dropwise over 2 hours to a solution of piperazine (15.0 g, 0.174 mol) in dichloromethane (436 mL). The reaction mixture was allowed to stir for 16 hours, then the solution was concentrated under reduced pressure to yield a solid that was treated with water (500 mL). The mixture was stirred vigorously and a white solid was isolated by filtration and washed with water. The solid was discarded. The filtrate was extracted with dichloromethane. The organic layer was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure to yield 12.7 g of tert-butyl piperazine-1-carboxylate as clear yellow crystals.

Part B

Bromoacetyl bromide (2.97 mL, 34.1 mmol) in dichloromethane (25 mL) was added dropwise to the solution of tert-butyl piperazine-1-carboxylate (6.35 g, 34.1 mmol) and diisopropylethylamine (5.8 mL, 33.3 mmol) in dichloromethane (38 mL) at 0° C. The solution was allowed to warm to ambient temperature and was stirred for 2 hours, then was poured into a separatory funnel. The solution was washed with water, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. Purification by flash chromatography (silica gel, eluting sequentially with 20%, 33%, and finally 50% ethyl acetate in hexanes) afforded 4.05 g of tert-butyl 4-(2-bromoacetyl)piperazine-1-carbamate as a brown crystalline solid.

Part C

The synthesis of 2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol is described in Parts A-I of Example 2. A mixture of 2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol (4.5 g, 15.8 mmol), tert-butyl 4-(2-bromoacetyl)piperazine-1-carbamate (4.57 g, 14.9 mmol), and potassium carbonate (3.27 g, 23.7 mmol) in DMF (158 mL) was heated to 55° C. for 2.5 hours, then was allowed to cool to room temperature and was stirred for 16 hours. The solution was poured into water (500 mL), which was extracted with diethyl ether (300 mL), ethyl acetate (300 mL) and dichloromethane (300 mL). The combined organic layers were concentrated under reduced pressure. The crude product was purified by flash chromatography (silica gel, gradient elution with 0-5% methanol in dichloromethane to provide 7.9 g of tert-butyl 4-({[2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}acetyl)piperazine-1-carboxylate as a tan waxy solid that contained 15% of DMF by weight.

Part D

The material from Part C was dissolved in chloroform (150 mL) and treated with mCPBA (70% w/w, 3.80 g, 15.4 mmol). The solution was stirred for 30 minutes, and additional mCPBA (1.0 g) was added. After 1 hour, the reaction was diluted with chloroform (150 mL) and washed with 1:1 saturated aqueous sodium carbonate/water. The layers were separated and the aqueous layer was extracted with chloroform. The organic layers were combined, washed with water and saturated aqueous sodium chloride, dried over sodium sulfate, filtered, and concentrated under reduced pressure to afford 14.9 g of approximately 54% pure tert-butyl 4-({[2-(ethoxymethyl)-5-oxido-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}acetyl)piperazine-1-carboxylate was isolated as a red-orange oil, which was used in the next step without purification.

Part E

A modification of the procedure described in Part C of Example 393 was used to convert the material from Part D into tert-butyl 4-({[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}acetyl)piperazine-1-carboxylate. After the p-toluenesulfonyl chloride (2.93 g, 15.4 mmol) was added, the reaction mixture was allowed to stir for 1 hour, then the ice bath was replaced with a water bath and the reaction mixture was allowed to stir for 16 hours. The mixture was diluted with dichloromethane and the layers were separated. The reaction was worked up as described in Example 393 and the crude product was recrystallized from acetonitrile to yield 4.7 g of tert-butyl 4-({[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}acetyl)piperazine-1-carboxylate as tan crystals, mp 192-197° C. (decomposition).

¹H NMR (300 MHz, DMSO-d₆) δ 7.55 (d, J=9.1 Hz, 1H), 7.41 (d, J=2.7 Hz, 1H), 7.15 (dd, J=9.1, 2.6 Hz, 1H), 6.36 (s, 2H), 4.96 (s, 2H), 4.77 (s, 2H), 4.54-4.49 (m, 2H), 3.59-3.31 (m, 10H), 1.93-1.81 (m, 2H), 1.41 (s, 9H), 1.16 (t, J=7.0 Hz, 3H), 1.02 (t, J=7.3 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 166.4, 153.7, 152.5, 150.6, 149.0, 140.2, 132.7, 127.5, 126.6, 117.0, 114.4, 102.8, 79.2, 66.9, 65.3, 64.2, 46.7, 44.2, 41.1, 28.0, 23.3, 14.9, 10.8;

MS (ESI) m/z 527.2992 (527.2982 calcd for C₂₇H₃₈N₆O₅, M+H⁺);

Anal. calcd for C₂₇H₃₈N₆O₅: C, 61.58; H, 7.27; N, 15.96. Found: C, 61.41; H, 7.49; N, 15.96.

Example 405 1-(3-{[4-Amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}propyl)pyrrolidin-2-one

Part A

The synthesis of 2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol is described in Parts A-I of Example 2. A modification of the method described in Part A of Example 392 was used to convert 2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol (1.5 g, 5.26 mmol) into 1-[3-(2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-yloxy)propyl]-pyrrolidin-2-one using 1-(3-hydroxypropyl)pyrrolidin-2-one (1.02 mL, 7.88 mL) in lieu of 3-(methylthio)propan-1-ol. After the reaction mixture was allowed to stir for 16 hours at ambient temperature, additional diisopropyl azodicarboxylate, triphenylphosphine, and 1-(3-hydroxypropyl)pyrrolidin-2-one (0.5 equivalent of each) were added and the reaction mixture was allowed to stir for 2 hours. The solvent was removed under reduced pressure and the resulting residue was purified by flash chromatography (silica gel, elution with ethyl acetate followed by gradient elution with 1-5% methanol in dichloromethane) to yield 2.9 g of 1-[3-(2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-yloxy)propyl]-pyrrolidin-2-one a pale yellow solid.

Part B

3-Chloroperoxybenzoic acid (50% pure, 1.8 g, 5.26 mmol) was added to a solution of 1-[3-(2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-yloxy)propyl]-pyrrolidin-2-one (2.9 g, 5.26 mmol) in chloroform (50 mL). After 30 minutes, saturated aqueous sodium carbonate (20 mL) was added to the solution and the resulting mixture was allowed to stir for 1 hour. The layers were separated and the aqueous layer was extracted with chloroform (3×50 mL). The organic layers were combined, washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by flash chromatography (silica gel, gradient elution with 1-4% methanol in dichloromethane) to yield 1.56 g of 1-(3-{[2-(ethoxymethyl)-5-oxido-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}propyl)pyrrolidin-2-one as a tan foam.

Step C

p-Toluenesulfonyl chloride (0.700 g, 3.66 mmol) was added to a stirred mixture of 1-(3-{[2-(ethoxymethyl)-5-oxido-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}propyl)pyrrolidin-2-one (1.56 g, 3.66 mmol), ammonium hydroxide (24 mL), and dichloromethane (36 mL) at room temperature. After 16 hours, the layers were separated and the aqueous layer was extracted with dichloromethane (3×50 mL). The organic layers were combined, washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. Recrystallization from acetonitrile afforded 0.759 g of 1-(3-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}propyl)pyrrolidin-2-one as off-white needles, mp 188.5-190° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.54 (d, J=9.1 Hz, 1H), 7.36 (d, J=2.6 Hz, 1H), 7.11 (dd, J=9.1, 2.6 Hz, 1H), 6.33 (s, 2H), 4.76 (s, 2H), 4.53-4.48 (m, 2H), 4.07 (t, J=6.2 Hz, 2H), 3.54 (q, J=7.0 Hz, 2H), 3.37 (t, J=7.0 Hz, 4H), 2.22-2.17 (m, 2H), 2.00-1.83 (m, 6H), 1.15 (t, J=7.0 Hz, 3H), 1.02 (t, J=7.3 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 173.8, 153.0, 150.5, 148.9, 140.0, 132.7, 127.6, 126.6, 117.2, 114.6, 102.3, 65.8, 65.3, 64.2, 46.8, 46.4, 39.1, 30.4, 26.8, 23.3, 17.5, 14.9, 10.7;

MS (ESI) m/z 426.2518 (426.2505 calcd for C₂₃H₃₁N₅O₃, M+H⁺);

Anal. calcd for C₂₃H₃₁N₅O₃: C, 64.92; H, 7.34; N, 16.46. Found: C, 64.80; H, 6.99; N, 16.37.

Example 406 2-(Ethoxymethyl)-1-propyl-8-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinolin-4-amine

The synthesis of 2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol is described in Parts A-I of Example 2. A modification of the method described in Part A of Example 405 was used to convert 2-ethoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol into 2-(ethoxymethyl)-1-propyl-8-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinoline using 3-hydroxytetrahydrofuran in lieu of 1-(3-hydroxypropyl)pyrrolidin-2-one. Modifications of the methods described in Parts B and C of Example 405 were used to convert 2-(ethoxymethyl)-1-propyl-8-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinoline into 2-(ethoxymethyl)-1-propyl-8-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinolin-4-amine. Parts B and C were combined by omitting the aqueous work up of Part B, in other words, the ammonium hydroxide and p-toluenesulfonyl chloride reagents used in Part C were added to the reaction mixture in Part B. The reaction was worked up as described in Part C of Example 405. 2-(Ethoxymethyl)-1-propyl-8-(tetrahydrofuran-3-yloxy)-1H-imidazo[4,5-c]quinolin-4-amine was isolated as tan needles, mp 173-175° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.56 (d, J=9.1 Hz, 1H), 7.34 (d, J=2.7 Hz, 1H), 7.11 (dd, J=9.1, 2.6 Hz, 1H), 6.36 (s, 2H), 5.21-5.14 (m, 1H), 4.78 (s, 2H), 4.58-4.48 (m, 2H), 3.97-3.76 (m, 4H), 3.56 (q, J=7.0 Hz, 2H), 2.31-2.19 (m, 1H), 2.13-2.04 (m, 1H), 1.97-1.84 (m, 2H), 1.16 (t, J=7.0 Hz, 3H), 1.02 (t, J=7.4 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 151.5, 150.6, 148.9, 140.4, 132.6, 127.8, 126.7, 117.8, 114.6, 103.3, 77.4, 72.2, 66.4, 65.3, 64.2, 46.8, 32.3, 23.3, 14.9, 10.8;

MS (ESI) m/z 371.2084 (371.2083 calcd for C₂₀H₂₆N₄O₃, M+H⁺);

Anal. calcd for C₂₀H₂₆N₄O₃: C, 64.85; H, 7.07; N, 15.12. Found: C, 64.50; H, 7.09; N, 15.29.

Example 407 N-(6-{[4-Amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexyl)-2-methylpropanamide

Part A

The synthesis of 2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol is described in Parts A-I of Example 2. The general method described in Part L of Example 2 was followed. 2-(Ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol (4.43 g, 15.5 mmol) was treated with tert-butyl 6-iodohexylcarbamate (prepared as described in Part F of Example 45, 6.1 g, 18.6 mmol). After the work up, the crude product was not purified to yield 9.9 g of tert-butyl 6-{[2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexylcarbamate as a tan waxy solid that contained DMF and dichloromethane.

Part B

A modification of the procedure described in Part B of Example 392 was used to convert the crude tert-butyl 6-{[2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexylcarbamate from Part A into tert-butyl 6-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexylcarbamate. The reaction mixture was transferred to a separatory funnel and the layers were separated. The aqueous layer was extracted with dichloromethane (2×100 mL). The organic layers were combined, washed with 5% aqueous sodium bicarbonate, water, and saturated aqueous sodium chloride. The organic layer was then dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by flash chromatography (silica gel, gradient elution 1-5% methanol in dichloromethane) to afford 4.60 g of tert-butyl 6-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexylcarbamate as a tan solid that contained some impurities but was used in the next step without further purification.

Part C

A solution of the material from Part B in 4.0 M ethanolic hydrogen chloride (22 mL) was heated at reflux for 1 hour. The solution was allowed to cool to room temperature and was concentrated under reduced pressure to yield an oily residue. Water (approximately 10 mL) and saturated aqueous sodium chloride (10 mL) were added to the oily residue, then the solution was adjusted to approximately pH 13 with 50% aqueous sodium hydroxide. The aqueous solution was extracted with 9:1 chloroform/methanol (2×100 mL). The organic layers were combined, dried over anhydrous magnesium sulfate, filtered, and concentrated under reduced pressure. The crude product was triturated with acetonitrile and a solid was isolated by filtration to afford 3.1 g of 8-(6-aminohexyloxy)-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-ylamine as a pale violet solid.

Part D

Isobutyryl chloride (0.236 mL, 2.25 mmol) was added dropwise, followed by triethylamine (0.2 mL, 1.4 mmol), to a stirred slurry of 8-(6-aminohexyloxy)-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-ylamine (0.900 g, 2.25 mmol) in dichloromethane (25 mL) at room temperature. After 30 minutes, water (15 mL) was added and the mixture was allowed to stir for 30 minutes. The layers were separated and the aqueous layer was extracted with dichlormethane. The organic layers were combined, washed with water and brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. Purification by flash chromatography (silica gel, gradient elution with 1-6% CMA in chloroform) followed by recrystallization from acetonitrile afforded 0.285 g of N-(6-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexyl)-2-methylpropanamide as a white crystalline solid, mp 136-138° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.64 (t, J=5.5 Hz, 1H), 7.53 (d, J=9.1 Hz, 1H), 7.35 (d, J=2.6 Hz, 1H), 7.10 (dd, J=9.1, 2.6 Hz, 1H), 6.31 (s, 2H), 4.76 (s, 2H), 4.53-4.48 (m, 2H), 4.07 (t, J=6.5 Hz, 2H), 3.54 (q, J=7.0 Hz, 2H), 3.02 (q, J=6.1 Hz, 2H), 2.37-2.23 (m, 1H), 1.96-1.83 (m, 2H), 1.80-1.71 (m, 2H), 1.50-1.26 (m, 6H), 1.15 (t, J=7.0 Hz, 3H), 1.02 (t, J=7.4 Hz, 3H), 0.96 (d, J=6.9 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 175.8, 153.2, 150.5, 148.8, 139.9, 132.7, 127.6, 126.6, 117.2, 114.6, 102.1, 67.6, 65.3, 64.2, 46.7, 38.2, 34.0, 29.1, 28.7, 26.1, 25.3, 23.3, 19.6, 14.9, 10.7;

MS (ESI) m/z 470.3118 (470.3131 calcd for C₂₆H₃₉N₅O₃, M+H⁺);

Anal. calcd for C₂₆H₃₉N₅O₃: C, 66.50; H, 8.37; N, 14.91. Found: C, 66.24; H, 8.35; N, 14.77.

Example 408 N-(6-{[4-Amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexyl)-N′-isopropylurea

A modification of the procedure described in Part A of Example 369 was used to convert 8-(6-aminohexyloxy)-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-ylamine (prepared as described in Parts A-C of Example 407, 0.900 g, 2.25 mmol) into N-(6-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexyl)-N′-isopropylurea. The crude product was purified by flash chromatography followed by recrystallization from acetonitrile to provide 0.528 g of N-(6-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexyl)-N′-isopropylurea as flocculent white crystals, mp 167-169° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.53 (d, J=9.1 Hz, 1H), 7.35 (d, J=2.6 Hz, 1H), 7.10 (dd, J=9.1, 2.6 Hz, 1H), 6.31 (s, 2H), 5.63 (t, J=5.6 Hz, 1H), 5.54 (d, J=7.7 Hz, 1H), 4.76 (s, 2H), 4.53-4.48 (m, 2H), 4.07 (t, J=6.5 Hz, 2H), 3.70-3.57 (m, 1H), 3.54 (q, J=7.0 Hz, 2H), 2.96 (q, J=6.1 Hz, 2H), 1.96-1.83 (m, 2H), 1.80-1.71 (m, 2H), 1.49-1.26 (m, 6H), 1.15 (t, J=7.0 Hz, 3H), 1.02 (t, J=7.3 Hz, 3H), 0.98 (d, J=6.5 Hz, 6H);

¹³C NMR (75 MHz, DMSO-d₆) δ 157.4, 153.2, 150.5, 148.8, 139.9, 132.7, 127.6, 126.6, 117.2, 114.6, 102.1, 67.7, 65.3, 64.2, 46.8, 40.7, 39.0, 30.0, 28.7, 26.2, 25.3, 23.3, 23.2, 14.9, 10.7;

MS (ESI) m/z 485.3237 (485.3240 calcd for C₂₆H₄₀N₆O₃, M+H⁺);

Anal. calcd for C₂₆H₄₀N₆O₃: C, 64.44; H, 8.32; N, 17.34. Found: C, 64.15; H, 8.43; N, 17.21.

Example 409 N-(6-{[4-Amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexyl)methanesulfonamide

A modification of the procedure described in Part D of Example 407 was used to convert 8-(6-aminohexyloxy)-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-ylamine (prepared as described in Parts A-C of Example 407, 0.900 g, 2.25 mmol) into N-(6-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexyl)methanesulfonamide. The reaction was run using methanesulfonyl chloride (0.174 mL, 2.25 mmol) in lieu of isobutyryl chloride and without triethylamine. The reaction was quenched with saturated aqueous sodium carbonate (10 mL) instead of water. The crude product was purified by flash chromatography followed by recrystallization from acetonitrile to afford 0.350 g of N-(6-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}hexyl)methanesulfonamide as flocculent white crystals, mp 164-167° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.53 (d, J=9.1 Hz, 1H), 7.36 (d, J=2.6 Hz, 1H), 7.10 (dd, J=9.1, 2.6 Hz, 1H), 6.91 (t, J=5.8 Hz, 1H), 6.31 (s, 2H), 4.76 (s, 2H), 4.54-4.48 (m, 2H), 4.08 (t, J=6.5 Hz, 2H), 3.54 (q, J=7.0 Hz, 2H), 2.92 (q, J=6.6 Hz, 2H), 2.86 (s, 3H), 1.96-1.84 (m, 2H), 1.81-1.72 (m, 2H), 1.53-1.31 (m, 6H), 1.15 (t, J=7.0 Hz, 3H), 1.02 (t, J=7.4 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 153.2, 150.5, 148.8, 139.9, 132.7, 127.6, 126.6, 117.2, 114.6, 102.1, 67.6, 65.3, 64.2, 46.8, 42.4, 39.1, 29.4, 28.6, 25.9, 25.2, 23.3, 14.9, 10.7;

MS (ESI) m/z 478.2485 (478.2488 calcd for C₂₃H₃₅N₅O₄S, M+H⁺);

Anal. calcd for C₂₃H₃₅N₅O₄S: C, 57.84; H, 7.39; N, 14.66. Found: C, 57.97; H, 7.60; N, 14.67.

Example 410 tert-Butyl 4-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}piperidine-1-carboxylate

Part A

The synthesis of 2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol is described in Parts A-I of Example 2. The general method described in Part A of Example 374 was followed starting with 2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol (6.0 g, 21.0 mmol). The crude product was purified by flash chromatography (silica gel, gradient elution with 1-7% CMA in chloroform) to yield 9.76 g of tert-butyl 4-{[2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}piperidine-1-carboxylate as a slightly impure tan semi-solid that was used in the next step without further purification.

Part B

A solution of the material from Part A (9.7 g, 20.7 mmol) and 32% peracetic acid in acetic acid (7.36 mL, 31.0 mmol) in ethyl acetate (69 mL) was heated at 50° C. for 3.5 hours. A solution of sodium metabisulfite (4.92 g, 25.9 mmol) in water (10 mL) was added over 15 minutes. The reaction mixture was allowed to stir at 50° C. for 30 minutes. Heating was discontinued and the reaction was adjusted to pH 10 with 50% aqueous sodium hydroxide. The mixture was allowed to cool to ambient temperature and was transferred to a separatory funnel. The layers were separated and the aqueous layer was extracted with ethyl acetate. The organic layers were combined and washed with water and saturated aqueous sodium chloride. The aqueous layers were combined and were back-extracted with dichloromethane. All the organic layers were combined, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 10-22% CMA in chloroform) to yield 4.5 g of tert-butyl 4-{[2-(ethoxymethyl)-5-oxido-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}piperidine-1-carboxylate as a orange-white solid.

Part C

Trichloroacetyl isocyanate (1.22 mL, 10.2 mmol) was added dropwise a stirred solution of tert-butyl 4-{[2-(ethoxymethyl)-5-oxido-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}piperidine-1-carboxylate (4.5 g, 9.29 mmol) in dichloromethane (90 mL) at room temperature. After 1.5 hours, ammonium hydroxide (4.5 mL) was added and the mixture was allowed to stir for 1 hour. Saturated aqueous sodium carbonate (60 mL) and water (20 mL) were added to the mixture. After 30 minutes, the mixture was transferred to a separatory funnel and the layers were separated. The aqueous layer was extracted with chloroform (2×100 mL). The organic layers were combined, washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 1-25% CMA in chloroform) followed by recrystallization from acetonitrile to yield 2.3 g of tert-butyl 4-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}piperidine-1-carboxylate as a gray solid, mp 179.5-181° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.55 (d, J=9.0 Hz, 1H), 7.42 (d, J=2.5 Hz, 1H), 7.16 (dd, J=9.0, 2.6 Hz, 1H), 6.36 (s, 2H), 4.77 (s, 2H), 4.69-4.61 (m, 1H), 4.55-4.50 (m, 2H), 3.75-3.65 (m, 2H), 3.56 (q, J=7.0 Hz, 2H), 3.28-3.15 (m, 2H), 2.01-1.82 (m, 4H), 1.68-1.54 (m, 2H), 1.41 (s, 9H), 1.16 (t, J=7.0 Hz, 3H), 1.03 (t, J=7.4 Hz, 3H);

MS (ESI) m/z 484.5 (M+H)⁺;

Anal. calcd for C₂₆H₃₇N₅O₄: C, 64.57; H, 7.71; N, 14.48. Found: C, 64.33; H, 7.91; N, 14.52.

Example 411 2-(Ethoxymethyl)-8-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

A solution of tert-butyl 4-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}piperidine-1-carboxylate (prepared as described in Example 410, 2.9 g, 6.0 mmol) and 4 M ethanolic hydrogen chloride (15 mL) in ethanol (20 mL) was heated at reflux for 2 hours. The solution was allowed to cool to ambient temperature and was concentrated under reduced pressure to approximately 17 mL, causing a solid to form. Water was added to dissolve the solid and the remainder of the ethanol was evaporated under reduced pressure. The aqueous solution was adjusted to approximately pH 13 with 50% aqueous sodium hydroxide, then was extracted with chloroform. The organic layers were combined, washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The product was recrystallization from acetonitrile to yield 1.25 g of 2-(ethoxymethyl)-8-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as off-white needles, mp 176-178° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.54 (d, J=9.0 Hz, 1H), 7.39 (d, J=2.6 Hz, 1H), 7.11 (dd, J=9.0, 2.6 Hz, 1H), 6.33 (s, 2H), 4.77 (s, 2H), 4.54-4.44 (m, 3H), 3.56 (q, J=7.0 Hz, 2H), 3.02-2.95 (m, 2H), 2.62-2.54 (m, 2H), 2.07-1.83 (m, 5H), 1.57-1.45 (m, 2H), 1.16 (t, J=7.0 Hz, 3H), 1.04 (t, J=7.4 Hz, 3H);

¹³C NMR (75 MHz, DMSO-d₆) δ 151.4, 150.5, 148.8, 140.0, 132.6, 127.7, 126.6, 118.5, 114.6, 104.0, 74.1, 65.3, 64.2, 46.8, 43.8, 32.4, 23.3, 14.9, 10.7;

MS (ESI) m/z 384.2414 (384.2400 calcd for C₂₁H₂₉N₅O₂, M+H⁺);

Anal. calcd for C₂₁H₂₉N₅O₂: C, 65.77; H, 7.62; N, 18.26. Found: C, 65.55; H, 7.60; N, 18.17.

Example 412 4-{[4-Amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}-N-isopropylpiperidine-1-carboxamide

Isopropyl isocyanate (0.190 mL, 1.90 mmol) was added dropwise to a solution of 2-(ethoxymethyl)-8-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (prepared as described in Example 411, 0.730 g, 1.90 mmol) in dichloromethane (15 mL) at room temperature. The reaction was diluted with dichloromethane and stirred vigorously. A precipitate formed that was isolated by filtration to afford 0.743 g of 4-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}-N-isopropylpiperidine-1-carboxamide as a white solid, mp 236.5-239° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.55 (d, J=9.0 Hz, 1H), 7.42 (d, J=2.5 Hz, 1H), 7.15 (dd, J=9.0, 2.5 Hz, 1H), 6.35 (s, 2H), 6.20 (t, J=7.6 Hz, 1H), 4.78 (s, 2H), 4.67-4.59 (m, 1H), 4.55-4.50 (m, 2H), 3.82-3.69 (m, 3H), 3.56 (q, J=7.0 Hz, 2H), 3.16-3.07 (m, 2H), 2.01-1.82 (m, 4H), 1.65-1.49 (m, 2H), 1.16 (t, J=7.0 Hz, 3H), 1.06 (d, J=6.6 Hz, 6H), 1.03 (t, J=7.4 Hz, 3H);

¹³C NMR (125 MHz, DMSO-d₆) δ 156.7, 151.3, 150.6, 148.9, 140.2, 132.6, 127.7, 126.6, 118.4, 114.7, 104.6, 73.0, 65.3, 64.2, 46.7, 41.7, 40.9, 30.5, 23.2, 22.9, 14.9, 10.8;

MS (ESI) m/z 469.2936 (469.2927 calcd for C₂₅H₃₆N₆O₃, M+H⁺);

Anal. calcd for C₂₅H₃₆N₆O₃: C, 64.08; H, 7.74; N, 17.93. Found: C, 63.85; H, 7.67; N, 17.89.

Example 413 2-(Ethoxymethyl)-8-{[1-(methylsulfonyl)piperidin-4-yl]oxy}-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Methanesulfonic anhydride (0.295 g, 1.69 mmol) was added in one portion to a stirred solution of 2-(ethoxymethyl)-8-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (prepared as described in Example 411, 0.650 g, 1.69 mmol) in dichloromethane (15 mL) at room temperature, resulting in a white precipitate. After 16 hours, 2.0 M aqueous sodium carbonate was added and the reaction mixture was allowed to stir for 45 minutes. The precipitate dissolved and the mixture was transferred to a separatory funnel where the layers were separated. The aqueous layer was extracted with chloroform. The organic layers were combined, washed with water and brine, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by trituration in boiling acetonitrile and isolated by filtration to yield 0.650 g of 2-(ethoxymethyl)-8-{[1-(methylsulfonyl)piperidin-4-yl]oxy}-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as an off-white crystalline solid, mp 240-243.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.57 (d, J=9.0 Hz, 1H), 7.43 (d, J=2.5 Hz, 1H), 7.18 (dd, J=9.0, 2.5 Hz, 1H), 6.38 (s, 2H), 4.78 (s, 2H), 4.70-4.61 (m, 1H), 4.55-4.50 (m, 2H), 3.56 (q, J=7.0 Hz, 2H), 3.44-3.36 (m, 2H), 3.20-3.12 (m, 2H), 2.92 (s, 3H), 2.10-2.00 (m, 2H), 1.95-1.79 (m, 4H), 1.16 (t, J=7.0 Hz, 3H), 1.03 (t, J=7.4 Hz, 3H);

¹³C NMR (125 MHz, DMSO-d₆) δ 151.3, 150.7, 148.9, 140.3, 132.6, 127.7, 126.6, 118.4, 114.7, 105.0, 71.4, 65.3, 64.2, 46.7, 42.5, 34.4, 29.8, 23.2, 14.9, 10.8;

MS (ESI) m/z 462.2172 (462.2175 calcd for C₂₂H₃₁N₅O₄S, M+H⁺);

Anal. calcd for C₂₂H₃₁N₅O₄S.0.15CHCl₃: C, 55.49; H, 6.55; N, 14.61; Cl, 3.33. Found: C, 55.51; H, 6.71; N, 14.66; Cl, 3.25.

Example 414 2-(Ethoxymethyl)-8-[(1-isobutyrylpiperidin-4-yl)oxy]-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

A modification of the procedure described in Example 413 was used. 2-(Ethoxymethyl)-8-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (prepared as described in Example 411, 0.650 g, 1.69 mmol) was treated with isobutyryl chloride instead of the methanesulfonic anhydride. After the work up, the crude product was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 2-25% CMA in chloroform) followed by recrystallization from acetonitrile to yield 0.500 g of 2-(ethoxymethyl)-8-[(1-isobutyrylpiperidin-4-yl)oxy]-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as a white solid, mp 177-179° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.56 (d, J=9.0 Hz, 1H), 7.44 (d, J=2.6 Hz, 1H), 7.17 (dd, J=9.1, 2.6 Hz, 1H), 6.36 (s, 2H), 4.78 (s, 2H), 4.78-4.68 (m, 1H), 4.55-4.50 (m, 2H), 3.96-3.74 (m, 2H), 3.56 (q, J=7.0 Hz, 2H), 3.46-3.36 (m, 1H), 2.98-2.83 (m, 1H), 2.09-1.80 (m, 4H), 1.76-1.53 (m, 2H), 1.16 (t, J=7.0 Hz, 3H), 1.03 (t, J=7.4 Hz, 3H), 1.01 (d, J=6.7 Hz, 6H);

¹³C NMR (125 MHz, DMSO-d₆) δ 174.1, 151.2, 150.6, 148.9, 140.2, 132.6, 127.7, 126.6, 118.3, 114.6, 104.8, 72.6, 65.3, 64.2, 46.7, 41.9, 38.3, 31.3, 30.3, 28.9, 23.2, 19.4, 14.9, 10.7;

MS (ESI) m/z 454.2819 (454.2818 calcd for C₂₅H₃₅N₅O₃, M+H⁺);

Anal. calcd for C₂₅H₃₅N₅O₃: C, 66.20; H, 7.78; N, 15.44. Found: C, 66.05; H, 7.72; N, 15.57.

Example 415 tert-Butyl 4-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate

Part A

2-(Ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol (3.00 g, 10.5 mmol) and triphenylphosphine (3.43 g, 13.1 mmol) were slurried in THF (105 mL) and cooled with an ice/water bath. tert-Butyl 4-hydroxypiperidine-1-carboxylate (2.64 g, 13.1 mmol) was added followed by the dropwise addition of diisopropyl azodicarboxylate (2.58 mL, 13.1 mmol). The water bath was removed and the mixture was stirred for 72 hours under nitrogen. The solvent was removed under reduced pressure and the residue was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 1-15% CMA in chloroform) to afford 5.17 g of tert-butyl 4-{[2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate as an off-white crystalline solid.

Part B

To a stirring solution of tert-butyl 4-{[2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate (5.17 g, 10.5 mmol) in chloroform (100 mL) was added 3-chloroperoxybenzoic acid (3.62 g, 10.5 mmol, based on 50% purity). After 30 minutes, concentrated ammonium hydroxide (50 mL) was added and the mixture was stirred for 30 minutes. p-Toluenesulfonyl chloride (2.00 g, 10.5 mmol) was added in 3 portions and the mixture was stirred for 16 hours. The layers were separated and the organic fraction was sequentially washed with 5% aqueous sodium bicarbonate, water, and saturated aqueous sodium chloride. The organic fraction was dried over anhydrous sodium sulfate, filtered and evaporated under reduced pressure. Recrystallization from acetonitrile afforded 2.58 g of tert-butyl 4-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate as a reddish-tan crystalline solid, mp 194-195° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.90 (d, J=9.0 Hz, 1H), 7.11 (d, J=2.6 Hz, 1H), 6.95 (dd, J=9.0, 2.6 Hz, 1H), 6.51 (s, 2H), 4.75 (s, 2H), 4.71-4.60 (m, 1H), 4.53-4.41 (m, 2H), 3.77-3.65 (m, 2H), 3.56 (q, J=7.0 Hz, 2H), 3.27-3.12 (m, 2H), 2.03-1.91 (m, 2H), 1.91-1.78 (m, 2H), 1.64-1.49 (m, 2H), 1.41 (s, 9H), 1.16 (t, J=7.0 Hz, 3H), 1.00 (t, J=7.4 Hz, 3H);

MS (ESI) m/z 484.3 (M+H)⁺;

Anal. calcd for C₂₆H₃₇N₅O₄: C, 64.57; H, 7.71; N, 14.48. Found: C, 64.36; H, 7.66; N, 14.65.

Example 416 2-(Ethoxymethyl)-7-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

tert-Butyl 4-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate (2.45 g, 5.07 mmol) was taken up in 4.0M ethanolic hydrogen chloride (15 mL) and heated to 65° C. for 1 hour. The heat was removed and the reaction was allowed to cool to ambient temperature. The ethanol was removed under reduced pressure and the solid residue was dissolved in water (10 mL) and saturated aqueous sodium chloride (10 mL). The solution was brought to pH 13 with 50% aqueous sodium hydroxide and then extracted with chloroform. The organic fraction was sequentially washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered and evaporated. Trituration with acetonitrile, followed by filtration afforded 1.70 g of 2-(ethoxymethyl)-7-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as a tan solid, mp 202-204° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.89 (d, J=9.0 Hz, 1H), 7.07 (d, J=2.5 Hz, 1H), 6.92 (dd, J=9.0, 2.5 Hz, 1H), 6.51 (s, 2H), 4.74 (s, 2H), 4.54-4.39 (m, 3H), 3.55 (q, J=7.0 Hz, 2H), 3.03-2.90 (m, 2H), 2.67-2.54 (m, 2H), 2.03-1.78 (m, 5H), 1.57-1.40 (m, 2H), 1.16 (t, J=7.0 Hz, 3H), 1.00 (t, J=7.3 Hz, 3H);

MS (ESI) m/z 384.2 (M+H)⁺;

Anal. calcd for C₂₁H₂₉N₅O₂: C, 65.77; H, 7.62; N, 18.26. Found: C, 65.61; H, 7.62; N, 18.23.

Example 417 4-{[4-Amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}-N-isopropylpiperidine-1-carboxamide

2-(Ethoxymethyl)-7-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.500 g, 1.3 mmol) was slurried in dichloromethane (13 mL). Isopropyl isocyanate was added dropwise to the slurry and the reaction was stirred for 16 hours. The reaction was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 2-22% CMA in chloroform) followed by recrystallization from acetonitrile yielded 0.430 g of 4-{[4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-yl]oxy}-N-isopropylpiperidine-1-carboxamide as a white solid, mp 163-164.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.90 (d, J=9.0 Hz, 1H), 7.11 (d, J=2.6 Hz, 1H), 6.94 (dd, J=9.0, 2.6 Hz, 1H), 6.52 (s, 2H), 6.19 (d, J=7.6 Hz, 1H), 4.75 (s, 2H), 4.58-4.52 (m, 1H), 4.52-4.41 (m, 2H), 3.84-3.66 (m, 3H), 3.55 (q, J=7.0 Hz, 2H), 3.18-3.04 (m, 2H), 2.02-1.77 (m, 4H), 1.62-1.44 (m, 2H), 1.16 (t, J=7.0 Hz, 3H), 1.06 (d, J=6.6 Hz, 6H), 1.00 (t, J=7.3 Hz, 3H);

¹³C NMR (125 MHz, DMSO-d₆) δ 156.7, 155.9, 152.3, 148.1, 147.0, 133.4, 124.9, 121.4, 112.6, 109.8, 108.9, 72.3, 65.3, 64.2, 46.7, 41.7, 40.9, 30.5, 23.0, 22.9, 14.9, 10.7;

MS (APCI) m/z 469.3 (M+H)⁺;

Anal. calcd for C₂₅H₃₆N₆O₃.0.4H₂O: C, 63.11; H, 7.80; N, 17.66. Found: C, 63.20; H, 7.94; N, 17.92.

Examples 418-422

A solution of 1 M boron tribromide in heptane (400 μL) was added to a 0° C., stirred solution of a starting material from the table below (approximately 25 mg) in dichloromethane (1 mL). The reaction mixture was stirred at 0° C. for 30 minutes and then at room temperature overnight. Methanol (1 mL) and 6 M aqueous hydrochloric acid (250 μL) was added to each reaction vessel, which was vortexed shortly afterwards. The volatiles were removed by vacuum centrifugation. The compounds were purified using the method described in Examples 376-386. The table below shows the starting material added to each reaction vessel, the structure of the resulting compound, and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 418-422

Measured Starting Mass Example Material R (M + H) 418 Example 56 

357.1910 419 Example 366

372.2025 420 Example 394

344.2099 421 Example 389

440.2666 422 Example 388

455.2815

Examples 423-438

A reagent (0.11 mmol, 1.1 equivalents) from the table below was added to a test tube containing 3-[4-amino-7-(2-aminoethoxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]propane-1,2-diol dihydrochloride (45 mg, 0.1 mmol, prepared as described in Example 373) and N,N-diisopropylethylamine (0.071 mL, 0.40 mmol) in N,N-dimethylacetamide (1 mL). The test tubes were capped and shaken overnight at room temperature and then two drops of water were added to each test tube. The solvent was removed by vacuum centrifugation. The compounds were purified using the method described in Examples 376-386. The table below shows the reagent added to each test tube, the structure of the resulting compound, and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 423-438

Measured Mass Example Reagent R (M + H) 423 None

376.2022 424 Acetyl chloride

418.2082 425 Cyclopropanecarbonyl chloride

444.2210 426 Butyryl chloride

446.2388 427 Isobutyryl chloride

446.2406 428 Benzoyl chloride

480.2225 429 Isonicotinoyl chloride hydrochloride

481.2214 430 Nicotinoyl chloride hydrochloride

481.2206 431 Methanesulfonyl chloride

454.1791 432 Ethanesulfonyl chloride

468.1954 433 1-Propanesulfonyl chloride

482.2046 434 Isopropylsulfonyl chloride

482.2057 435 Dimethylsulfamoyl chloride

483.2048 436 1-Butanesulfonyl chloride

496.2247 437 Benzenesulfonyl chloride

516.1933 438 1-Methylimidazole-4- sulfonyl chloride

520.1968

Examples 439-459

The free base of 3-[4-amino-2-(ethoxymethyl)-7-(piperidin-4-yloxy)-1H-imidazo[4,5-c]quinolin-1-yl]propane-1,2-diol dihydrochloride (prepared as described in Example 375) was prepared. A reagent (0.11 mmol, 1.1 equivalents) from the table below was added to a test tube containing 3-[4-amino-2-(ethoxymethyl)-7-(piperidin-4-yloxy)-1H-imidazo[4,5-c]quinolin-1-yl]propane-1,2-diol (42 mg, 0.10 mmol) and N,N-diisopropylethylamine (0.033 mL, 0.20 mmol) in N,N-dimethylacetamide (1 mL). The test tubes were capped and shaken overnight at room temperature and then two drops of water were added to each test tube. The solvent was removed by vacuum centrifugation. The compounds were purified using the method described in Examples 376-386. The table below shows the reagent added to each test tube, the structure of the resulting compound, and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 439-459

Measured Mass Example Reagent R (M + H) 439 None

416.2302 440 Methyl chloroformate

474.2354 441 Cyclopropane- carbonyl chloride

484.2601 442 Isobutyryl chloride

486.2735 443 Cyclopentane- carbonyl chloride

512.2896 444 Cyclohexane- carbonyl chloride

526.3023 445 Isonicotinoyl chloride hydrochloride

521.2510 446 Nicotinoyl chloride hydrochloride

521.2501 447 Benzene- sulfonyl chloride

556.2224 448 1-Methylimid- azole-4- sulfonyl chloride

560.2277 449 Methyl isocyanate

473.2537 450 Ethyl isocyanate

487.2658 451 Isopropyl isocyanate

501.2823 452 Cyclopentyl isocyanate

527.2974 453 Phenyl isocyanate

535.2666 454 N,N- Dimethyl- carbamoyl chloride

487.2687 455 1-Pyrrolidine- carbonyl chloride

513.2853 456 1-Piperidine- carbonyl chloride

527.3002 457 4-Morpholine- carbonyl chloride

529.2791 458 4-Methyl-1- piperazine- carbonyl chloride

542.3113 459 N-Methyl-N- phenylcarbamoyl chloride

549.2811

Examples 460-477

The free base of 3-[4-amino-2-(ethoxymethyl)-7-(piperidin-4-yloxy)-1H-imidazo[4,5-c]quinolin-1-yl]propane-1,2-diol dihydrochloride (prepared as described in Example 375) was prepared. An aldehyde or ketone (0.125 mmol, 1.25 equivalents) from the table below was added to a test tube containing 3-[4-amino-2-(ethoxymethyl)-7-(piperidin-4-yloxy)-1H-imidazo[4,5-c]quinolin-1-yl]propane-1,2-diol (42 mg, 0.10 mmol) in N,N-dimethylacetamide (1 mL). The test tubes were capped and shaken for 30 minutes at room temperature. Borane-pyridine complex (16 μL, 0.13 mmol) was added to each of the tubes. The test tubes were capped and shaken overnight at room temperature, then two drops of water were added to each test tube. The solvent was removed by vacuum centrifugation. The compounds were purified using the method described in Examples 376-386. The table below shows the aldehyde or ketone added to each test tube, the structure of the resulting compound, and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 460-477

Measured Mass Example Reagent R (M + H) 460 None

416.2328 461 Cyclopropane- carboxaldehyde

470.2766 462 Isobutyraldehyde

472.2943 463 Butyraldehyde

472.2970 464 Tetrahydrofuran-3- carboxaldehyde

500.2865 465 Benzaldehyde

506.2785 466 Picolinaldehyde

507.2712 467 1-Methyl-2- imidazole- carboxaldehyde

510.2865 468 m-Tolualdehyde

520.2944 469 o-Tolualdehyde

520.2950 470 p-Tolualdehyde

520.2921 471 Phenylace- taldehyde

520.2942 472 2-Fluoroben- zaldehyde

524.2708 473 3-Fluoroben- zaldehyde

524.2668 474 4-Fluoroben- zaldehyde

524.2665 475 3-Methoxyben- zaldehyde

536.2888 476 3-Chloroben- zaldehyde

540.2387 477 1-Acetyl-4- piperidone

541.3156

Examples 478-503 Part A

A mixture of 2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol (prepared as described in Parts A-I of Example 2, 3.00 g, 10.5 mmol), 1-bromo-3-chloropropane (1.82 g, 11.6 mmol), and cesium carbonate (10.27 g, 31.53 mmol) in DMF (50 mL) was heated at 50° C. for 8 hours. The reaction mixture was allowed to cool to room temperature and was stirred over a weekend. The slurry was poured into a solution of sodium chloride (200 g) in water (800 mL). After 6 hours, a precipitate had formed that was isolated by filtration. The precipitate was dissolved in dichloromethane/chloroform, dried over magnesium sulfate, and filtered. The filtrate was used in the next reaction.

Part B

mCPBA (60% pure, 3.3 g, 11.5 mmol) was added in portions to the stirred filtrate from Part A at room temperature. The reaction mixture was stirred overnight. Concentrated ammonium hydroxide was added followed by p-toluenesulfonyl chloride (2.20 g, 11.5 mmol) in small portions. After 2 hours, 1% aqueous sodium carbonate was added and the mixture was stirred for 1 hour. The mixture was transferred to a separatory funnel and the layers were separated. The organic phase was washed with 1% aqueous sodium carbonate (2×75 mL). The aqueous phases were combined and extracted with dichloromethane (1×100 mL). The organic layers were dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 0-25% CMA in chloroform) to provide 2.4 g of 8-(3-chloropropoxy)-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine.

Part C

An amine (0.15 mmol, 1.5 equivalents) from the table below was added to a test tube containing 8-(3-chloropropoxy)-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (38 mg, 0.10 mmol) and potassium carbonate (55 mg, 0.40 mmol) in N,N-dimethylacetamide (1 mL). The test tubes were capped and heated at 70° C. for 16 hours, then at 85° C. for 6 hours. After the reaction mixtures were filtered, the solvent was removed by vacuum centrifugation. The compounds were purified using the method described in Examples 376-386. The table below shows the amine added to each test tube, the structure of the resulting compound, and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 478-503

Measured Mass Example Reagent R (M + H) 478 None

377.1718 479 Piperidine

426.2886 480 3-Methyl- piperidine

440.3015 481 1-Methyl- piperazine

441.3000 482 3-(Dimethylamino)- pyrrolidine

455.3170 483 N-Methylhomo- piperazine

455.3141 484 2-Piperidine- methanol

456.2928 485 3-Azabicyclo- [3.2.2]nonane

466.3185 486 Isonipecotamide

469.2953 487 Nipecotic acid

470.2718 488 N-(2-Hydroxy- ethyl)- piperazine

471.3096 489 1,2,3,4- Tetrahydroiso- quinoline

474.2879 490 Decahydroiso- quinoline

480.3345 491 Decahydro- quinoline

480.3343 492 1,3,3-Trimethyl-6- azabicyclo[3.2.1]- octane

494.3507 493 4-(1-Pyrrolidinyl)- piperidine

495.3468 494 1-(2-Ethoxyethyl)- piperazine

499.3405 495 2-Benzyl- 2-imidazoline

501.3005 496 4-Phenyl- piperidine

502.3179 497 1-Phenyl- piperazine

503.3112 498 1-(2-Pyridyl)- piperazine

504.3083 499 1-(4-Pyridyl)- piperazine

504.3085 500 1-(2-Pyrimidyl)- piperazine

505.3041 501 1-Cyclohexyl- piperazine

509.3608 502 4-Piperidino- piperidine

509.3599 503 1-[2-(2- Hydroxyethoxy)- ethyl]piperazine

515.3372

Examples 504-522 Part A

A mixture of 4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol hydrochloride (prepared using a modification on the procedure described in Parts A and B of Example 51, 2.5 g, 7.4 mmol), 1-chloro-3-iodopropane (1.7 g, 8.2 mmol), and potassium carbonate (3.1 g, 22 mmol) in DMF (25 mL) was stirred overnight, then triethylamine (2 mL) was added and the reaction mixture was heated to 70° C. for 8 hours. The mixture was allowed to cool to room temperature and was stirred overnight. The mixture was poured into water (500 mL) and solid sodium hydroxide was added to adjust the mixture to pH 14. The mixture was extracted with chloroform (300 mL followed by 3×75 mL). The organic layers were thrown away and the aqueous layer was adjusted to pH 10 with 10% aqueous hydrochloric acid. A precipitate formed and was isolated by filtration. The solid was subjected to the initial reaction conditions, and this time methanol (25 mL) was added. After 3 hours at room temperature, the reaction mixture was heated at 90° C. and potassium carbonate (1 g) and 1-chloro-3-bromopropane (1 mL) were added. After 3 hours, the reaction mixture was allowed to cool to room temperature, was filtered, and the methanol was removed under reduced pressure. The solution was poured into water (300 mL) and sodium chloride (200 g) was added, causing a precipitate to form within 30 minutes. After 1 hour, the precipitate was filtered, dissolved in a minimal amount of chloroform, and purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 0-15% CMA in chloroform) to yield 900 mg of 7-(3-chloropropoxy)-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine.

Part B

An amine (0.2 mmol, 2.0 equivalents) from the table below was added to a test tube containing 7-(3-chloropropoxy)-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (38 mg, 0.10 mmol) and potassium carbonate (55 mg, 0.40 mmol) in N,N-dimethylacetamide (1 mL). The test tubes were capped and heated at 90° C. for 10 hours. After the reaction mixtures were filtered, the solvent was removed by vacuum centrifugation. The compounds were purified using the method described in Examples 376-386. The table below shows the amine added to each test tube, the structure of the resulting compound, and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 504-522

Measured Mass Example Reagent R (M + H) 504 Pyrrolidine

412.2679 505 Piperidine

426.2837 506 Morpholine

428.2685 507 4-Methyl- piperidine

440.2992 508 Hexamethyl- eneimine

440.2983 509 1-Methyl- piperazine

441.2997 510 4-Hydroxy- piperidine

442.2843 511 Thiomorpholine

444.2455 512 3- (Dimethylamino)- pyrrolidine

455.3094 513 N-Methylhomo- piperazine

455.3110 514 3- (Hydroxymethyl)- piperidine

456.2964 515 Isonipecotamide

469.2969 516 Nipecotamide

469.2942 517 1-Acetylpiperazine

469.2945 518 4-Piperidineethanol

470.3167 519 N-(2- Hydroxyethyl)- piperazine

471.3084 520 1,2,3,4- Tetrahydroiso- quinoline

474.2891 521 Decahydroiso- quinoline

480.3346 522 1-(2- Methoxyethyl)- piperazine

485.3240

Examples 523-550 Part A

A solution of methoxyacetyl chloride (7.0 g, 64.5 mmol) in dichloromethane (10 mL) was added dropwise to a stirred solution of 6-(benzyloxy)-N⁴-propylquinoline-3,4-diamine (prepared as described in Parts A-F of Example 2, approximately 58.7 mmol) in dichloromethane (300 mL) at room temperature. After one hour, the solvent was removed under reduced pressure to yield a solid that was dissolved in ethanol (300 mL). After 2% aqueous potassium carbonate (100 mL) was added, the reaction was heated at reflux for 30 minutes, then stirred at room temperature overnight. The reaction mixture was concentrated under reduced pressure, then was partitioned between dichloromethane (300 mL) and 2% aqueous potassium carbonate (100 mL). The aqueous layer was extracted with dichloromethane (3×100 mL). The organic layers were combined, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by chromatography (silica gel, sequential elution with 4% then 7% methanol in dichloromethane) to yield 18.2 g of a black solid that was used in the next step.

Part B

mCPBA (60% pure, 15.7 g, 54.8 mmol) was added in small portions to a solution of the material from Part A (18.0 g, 49.8 mmol) in dichloromethane (200 mL). After the reaction was complete, 2% aqueous sodium carbonate was added and the mixture was stirred vigorously. An emulsion formed and chloroform and water were added. After two hours, the mixture was extracted multiple times with chloroform. The combined organic layers were dried over magnesium sulfate and filtered. The filtrate was used in the next step.

Part C

Trichloroacetyl isocyanate (6.5 mL, 54.8 mmol) was added slowly to the stirred filtrate from Part B. After 4 hours, additional isocyanate was added and the solution was stirred overnight. The reaction mixture was concentrated under reduced pressure and the residue was dissolved in dichloromethane (400 mL). Concentrated ammonium hydroxide (20 mL) was added and the mixture was stirred at room temperature for 1 hour, then 2% aqueous sodium carbonate (300 mL). The mixture was transferred to a separatory funnel and the layers were separated. The aqueous layer, an emulsion, was extracted multiple times with chloroform. The organic layers were combined, dried over magnesium sulfate, filtered, and concentrated under reduced pressure to yield a dark brown solid that was used in the next step.

Part D

A mixture of the material from Part C and 10% palladium on carbon in ethanol/methanol (600 mL) was hydrogenated on a Parr apparatus at 30 psi (2.1×10⁵ Pa) for 72 hours. The reaction mixture was filtered, and the filtrate was concentrated under reduced pressure. The resulting solid was treated with 2% aqueous sodium carbonate (300 mL), then concentrated hydrochloric acid was added to adjust to pH 1. After most of the solid had dissolved, the pH of the solution was adjusted to pH 7 with sodium carbonate, causing a precipitate to form. The mixture was stirred overnight. The solid was isolated by filtration and used in the next step without purification.

Part E

A mixture of the material from Part D (2.5 g, 8.7 mmol), 1-bromo-3-chloropropane (0.94 mL, 9.6 mmol), and cesium carbonate (5.7 g, 17.4 mmol) in DMF (50 mL) was stirred overnight at room temperature. Additional cesium carbonate (1 equivalent) was added and the mixture was heated to 50° C. overnight. The mixture was allowed to cool to room temperature and was poured into a solution of sodium chloride (250 g) in water (800 mL). After 20 minutes, a dark precipitate formed and was isolated by filtration. The solid was dissolved in chloroform, dried over magnesium sulfate, filtered, and concentrated. The crude product was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 0-30% of a 20% methanol in dichloromethane solution in dichloromethane) to yield 1.18 g of 8-(3-chloropropoxy)-2-(methoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine that contained some impurities.

Part F

An amine (0.15 mmol, 1.5 equivalents) from the table below was added to a test tube containing 8-(3-chloropropoxy)-2-(methoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (36 mg, 0.10 mmol) and potassium carbonate (55 mg, 0.40 mmol) in N,N-dimethylacetamide (1 mL). The test tubes were capped and heated at 90° C. for 16 hours. After the reaction mixtures were filtered, the solvent was removed by vacuum centrifugation. The compounds were purified using the method described in Examples 376-386. The table below shows the amine added to each test tube, the structure of the resulting compound, and the observed accurate mass for the isolated trifluoroacetate salt.

Examples 523-550

Measured Mass Example Reagent R (M + H) 523 None

363.1563 524 Pyrrolidine

398.2574 525 Piperidine

412.2709 526 Morpholine

414.2532 527 Thiazolidine

416.2142 528 3-Methylpiperidine

426.2871 529 4-Methylpiperidine

426.2856 530 Hexamethyleneimine

426.2835 531 1-Methylpiperazine

427.2804 532 3-Hydroxypiperidine

428.2652 533 4-Hydroxypiperidine

428.2681 534 Thiomopholine

430.2297 535 3-(Dimethylamino)pyrrolidine

441.2975 536 N-Ethylpiperazine

441.2952 537 N-Methylhomopiperazine

441.2940 538 2-Piperidinemethanol

442.2831 539 3-(Hydroxymethyl)piperidine

442.2821 540 4-(Hydroxymethyl)piperidine

442.2847 541 Isonipecotamide

455.2816 542 1-Acetylpiperazine

455.2813 543 Isonipecotic acid

456.2655 544 Nipecotic acid

456.2640 545 2-Piperidineethanol

456.3009 546 4-Piperidineethanol

456.3000 547 N-(2-Hydroxyethyl)piperazine

457.2939 548 2-Benzyl-2-imidazoline

487.2834 549 4-Phenylpiperazine

489.3026 550 1-(2-Pyrimidyl)piperazine

491.2915

Example 551 tert-Butyl 2-{[4-amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate

Part A

Ammonium hydroxide (1 L) was added to a solution of methyl tetrahydro-2H-pyran-4-carboxylate (20 mL, 150 mmol) in methanol (500 mL), and the reaction was stirred overnight at ambient temperature. Additional ammonium hydroxide (500 mL) was added, and the reaction was stirred for four additional days. The methanol was removed under reduced pressure. Solid sodium chloride was added to the aqueous layer, which was extracted with chloroform (3×150 mL). The combined extracts were dried over sodium sulfate, filtered, and concentrated under reduced pressure to provide 11.4 g of tetrahydro-2H-pyran-4-carboxamide as a white solid.

Part B

A solution of tetrahydro-2H-pyran-4-carboxamide (11.4 g, 88.3 mmol) in THF (441 mL) was cooled to 0° C. Lithium aluminum hydride (10.0 g, 265 mmol) was added in six portions over a period often minutes. The reaction flask was purged with nitrogen between the additions. When the reaction mixture was no longer bubbling, it was heated at reflux for six hours. The reaction was then cooled to 0° C., and ethyl acetate was added dropwise until bubbling ceased. Methanol was then added dropwise until bubbling ceased. Water (10 mL), 15% aqueous sodium hydroxide (10 mL), and water (30 mL) were sequentially added. The organic fraction was decanted off, and the remaining gray solid was washed with chloroform. The combined organic fractions were dried over sodium sulfate, filtered, and concentrated under reduced pressure to provide tetrahydro-2H-pyran-4-ylmethylamine.

Part C

7-(Benzyloxy)-3-nitroquinolin-4-ol (12.3 g, 41.6 mmol) was slurried in DMF (83 mL). Phosphorous oxychloride (4.2 mL, 45 mmol) was added in one portion and the mixture was heated at 100° C. for 5 minutes. The solution was allowed to cool to 40° C. and was then poured into ice water (total volume 400 mL) resulting in a tan precipitate. The precipitate was filtered and washed with water. After drying, the solid was dissolved in dichloromethane and the residual water was separated. The organic fraction was dried over anhydrous sodium sulfate and anhydrous magnesium sulfate (about a 50/50 mixture). The organic fraction was filtered into a reaction flask (total volume of organic with 7-(benzyloxy)-3-chloro-4-nitroquinoline is about 425 mL). The flask was cooled to 8° C. and triethylamine (11.6 mL, 83.0 mmol) was added. (Tetrahydro-2H-pyran-4-yl)methylamine (6.0 g, 52 mmol) in dichloromethane (50 mL) was added dropwise to the mixture. The cooling bath was removed and the reaction was stirred for 16 hours. Water (200 mL) was added followed by stirring for 30 minutes. The layers were separated and the organic fraction was sequentially washed with saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. Recrystallization from 2-propanol afforded 14.1 g of 7-(benzyloxy)-3-nitro-N-(tetrahydro-2H-pyran-4-ylmethyl)quinolin-4-amine as a yellow powder.

Part D

7-(Benzyloxy)-3-nitro-N-(tetrahydro-2H-pyran-4-ylmethyl)quinolin-4-amine (14.1 g, 35.6 mmol) and 5% platinum on carbon (2.0 g) were added to a Parr vessel. The solids were covered with acetonitrile (200 mL) and placed on a hydrogenator. The vessel was degassed three times, then charged with 50 psi (3.4×10⁵ Pa) hydrogen and allowed to shake for 3 hours, replenishing the hydrogen as needed. After 6 hours, the catalyst was removed by filtration through CELITE filter agent. The CELITE was washed with acetonitrile until the filtrate ran clear (˜300 mL). The solvent was evaporated to ½ volume under reduced pressure and cooled to 8° C. Propionyl chloride (3.15 mL, 35.6 mmol) was added dropwise to the solution over 3 minutes. The cooling bath was removed and the reaction was stirred for 16 hours. The resulting precipitate was filtered and washed with acetonitrile. Drying under vacuum for 1 hour afforded 14.2 g of N-{7-(benzyloxy)-4-[(tetrahydro-2H-pyran-4-ylmethyl)amino]quinolin-3-yl}propanamide dihydrochloride as a tan solid.

Part E

N-{7-(Benzyloxy)-4-[(tetrahydro-2H-pyran-4-ylmethyl)amino]quinolin-3-yl}propanamide dihydrochloride (14.2 g, 31.1 mmol) was slurried in ethanol (150 mL) and diluted with water (50 mL). Potassium carbonate (12.3 g, 89 mmol) in water (15 mL) was added and the reaction was stirred until dissolution (˜30 minutes). The reaction was then heated to 60° C. for 16 hours. The ethanol was evaporated under reduced pressure and the remaining water was extracted with dichloromethane. The organic fraction was sequentially washed with water, followed by saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered and concentrated. Recrystallization from acetonitrile afforded 8.4 g of 7-(benzyloxy)-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinoline as a tan powder.

Part F

7-(Benzyloxy)-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinoline (8.3 g, 20.7 mmol) was added to a Parr vessel containing 10% palladium on carbon (1.5 g) wetted with acetonitrile. Methanol (160 mL) was added and the vessel was placed on the hydrogenator. The vessel was degassed three times and charged with 50 psi (3.4×10⁵ Pa) hydrogen. The vessel was allowed to shake for 16 hours, replenishing the hydrogen as needed. The catalyst was removed by filtration through glass fiber filter paper. The catalyst was washed with 3:1 chloroform/methanol. The filtrates were combined. Evaporation under reduced pressure afforded 6.1 g of 2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-ol as a gray solid.

Part G

The material was prepared using the general method described in Part A of Example 390. tert-Butyl 2-iodoethylcarbamate (5.26 g, 19.4 mmol added over 24 hours, then 1 g, 3.70 mmol after 72 hours), was used in lieu of t-butyl 3-iodopropylcarbamate. Purification via chromatography on a HORIZON HPFC system (gradient elution with 2-25% CMA in chloroform), followed by recrystallization from acetonitrile afforded 2.34 g of tert-butyl 2-{[2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate as white flakes.

Part H

tert-Butyl 2-{[2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate (2.3 g, 5.06 mmol) was slurried in ethyl acetate (20 mL). 32% Peracetic acid in acetic acid (1.06 mL, 5.06 mmol) was added in one portion and the reaction was heated to 50° C. for 2 hours. Another 0.250 mL (1.19 mmol) peracetic acid solution was added and the reaction was stirred for 1 additional hour. Sodium metabisulfite (1.2 g, 6.33 mmol) in water (2.5 mL) was added over 3 minutes and the reaction was stirred for 30 minutes. The heat was removed and the reaction was brought to pH 10 with saturated aqueous sodium carbonate (˜10 mL). The milky slurry was cooled in an ice bath and subsequently filtered. The solid was washed with water and dried for 1 hour. Roughly 2.0 g of tert-butyl 2-{[2-ethyl-5-oxido-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate was isolated as an off-white solid with water still remaining.

Part I

tert-Butyl 2-{[2-ethyl-5-oxido-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate (wet from above) was slurried in dichloromethane (25 mL) and ammonium hydroxide (25 mL). p-Toluenesulfonyl chloride (0.810 g, 4.25 mmol) was added in one portion and the reaction was stirred for 16 hours. The layers were separated and the aqueous fraction was extracted with dichloromethane. The combined organic fractions were washed with water, then saturated aqueous sodium chloride. The organic fraction was dried over anhydrous sodium sulfate, filtered and concentrated. The material was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 2-20% CMA in chloroform) to afford 1.8 g of tert-butyl 2-{[4-amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate as a white foam. Recrystallization from acetonitrile of a small portion provided an analytical sample as a white solid, mp 200-201° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.92 (d, J=9.1 Hz, 1H), 7.05 (d, J=2.7 Hz, 1H), 7.02 (t, J=5.3 Hz, 1H), 6.90 (dd, J=9.0, 2.6 Hz, 1H), 6.38 (s, 2H), 4.39-4.36 (m, 2H), 4.04 (t, J=5.8 Hz, 2H), 3.84-3.79 (m, 2H), 3.34 (q, J=5.7 Hz, 2H), 3.21-3.08 (m, 2H), 2.91 (q, J=7.4 Hz, 2H), 2.14-1.97 (m, 1H), 1.54-1.36 (m, 4H), 1.39 (s, 9H), 1.36 (t, J=7.4 Hz, 3H);

¹³C NMR (125 MHz, DMSO-d₆) δ 155.0, 155.7, 153.7, 152.0, 146.6, 132.9, 125.1, 121.2, 111.5, 109.1, 108.2, 77.7, 66.6, 66.2, 49.6, 35.7, 29.6, 28.2, 20.1, 12.1;

MS (APCI) m/z 470.3 (M+H)⁺;

Anal. calcd for C₂₅H₃₅N₅O₄: C, 63.95; H, 7.51; N, 14.91. Found: C, 63.80; H, 7.54; N, 15.06.

Example 552 7-(2-Aminoethoxy)-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine dihydrochloride

tert-Butyl 2-{[4-amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate (1.8 g, 3.83 mmol) was added to 4.0M ethanolic hydrogen chloride (13 mL) and the reaction was heated to 65° C. for 1 hour. The milky slurry solidified after 20 minutes. Ethanol (10 mL) was added to loosen the solid. After 1 hour, the heat was removed and the reaction was allowed to cool to ambient temperature. Filtration afforded 1.3 g of 7-(2-aminoethoxy)-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine dihydrochloride as a white solid, mp 238° C., decomposition.

¹H NMR (300 MHz, DMSO-d₆) δ 14.24 (s, 1H), 8.75 (br s, 2H), 8.43 (br s, 3H), 8.20 (d, J=9.2 Hz, 1H), 7.36 (d, J=2.5 Hz, 1H), 7.26 (dd, J=9.1, 2.4 Hz, 1H), 4.50-4.47 (m, 2H), 4.36 (t, J=4.9 Hz, 2H), 3.85-3.81 (m, 2H), 3.36-3.23 (m, 2H), 3.22-3.07 (m, 2H), 2.99 (q, J=7.4 Hz, 2H), 2.13-1.94 (m, 1H), 1.59-1.40 (m, 4H), 1.40 (t, J=7.4 Hz, 3H);

¹³C NMR (125 MHz, DMSO-d₆) δ 158.3, 157.4, 148.9, 135.5, 135.3, 123.5, 122.9, 114.0, 106.9, 102.1, 66.5, 64.7, 49.9, 38.1, 35.6, 29.4, 20.2, 11.6;

MS (ESI) m/z 370.2 (M+H)⁺.

Example 553 2-Ethyl-7-(2-morpholin-4-yl-2-oxoethoxy)-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine

Part A

mCPBA (2.0 g of 60%, 6.97 mmol) was added to a solution of 7-benzyloxy-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinoline (2.8 g, 6.97 mmol) in chloroform (50 mL). After 30 minutes an additional equivalent of mCPBA was added and the reaction mixture was stirred for an additional hour. Ammonium hydroxide (20 mL) was added and the reaction mixture was stirred for 10 minutes. p-Toluenesulfonyl chloride (1.33 g, 6.97 mmol) was added in a single portion and the reaction mixture was stirred for 16 hours. The layers were separated and the aqueous layer was extracted with dichloromethane (2×100 mL). The organics were combined, washed with water and brine, dried over sodium sulfate, filtered, and then concentrated under reduced pressure. The residue was purified by chromatography on a HORIZON HPFC system (40+M cartridge eluting with a gradient of 2 to 25% CMA in chloroform). The residue was combined with acetonitrile and allowed to stand overnight. A solid was isolated by filtration and rinsed with acetonitrile to provide 1.96 g of 7-benzyloxy-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine as a tan solid.

Part B

A mixture of 7-benzyloxy-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine (1.76 g, 4.23 mmol), palladium on carbon (1 g), and ethanol (50 mL) was shaken under hydrogen pressure (50 psi, 3.4×10⁵ Pa) on a Parr apparatus overnight. The reaction mixture was diluted with dichloromethane (75 mL) and then filtered through a layer of CELITE filter agent. The filter cake was rinsed with 25% methanol in chloroform (400 mL). The combined filtrates were concentrated under reduced pressure to provide a white solid. This material was slurried with methanol, isolated by filtration, and dried under vacuum to provide 0.98 g of 4-amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-ol.

Part C

A mixture of 4-amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-ol (500 mg, 1.53 mmol), 2-bromo-1-(morpholin-4-yl)ethanone (351 mg, 1.69 mmol), cesium carbonate (1.5 g, 4.59 mmol) and anhydrous DMF was heated at 70° C. overnight. The reaction mixture was cooled, poured into water (350 mL), and then extracted with dichloromethane (2×100 mL). The combined organics were dried over magnesium sulfate, filtered, and then concentrated under reduced pressure. The residue was dissolved in dichloromethane and filtered. The filtrate was purified by chromatography on a HORIZON HPFC system (eluting with a gradient of 0 to 8% methanol in dichloromethane). The product was recrystallized from acetonitrile to provide 362 mg of 2-ethyl-7-(2-morpholin-4-yl-2-oxoethoxy)-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine as a white powder, mp 245-247° C. Anal. calcd for C₂₄H₃₁N₅O₄: C, 63.56; H, 6.89; N, 15.44. Found: C, 63.20; H, 6.78; N, 15.31.

Example 554 2-Methoxymethyl-8-(3-morpholin-4-ylpropoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Part A

Cesium carbonate (5.7 g, 17.4 mmol, 2 eq) was added to a mixture of 8-hydroxy-2-methoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (2.5 g, 8.7 mmol, 1 eq), prepared as described in Examples 523-550 Parts A-D, 1-bromo-3-chloropropane (0.94 mL, 9.6 mmol, 1.1 eq), and 50 mL of N,N-dimethylformamide (DMF). The reaction mixture was stirred overnight. Analysis by HPLC indicated the reaction was incomplete. Additional cesium carbonate (2.85 g) was added to the reaction mixture and the mixture was heated to 50° C. overnight. Analysis by HPLC indicated the reaction was complete and the reaction mixture was poured into a brine solution (250 g of sodium chloride in 800 mL of deionized water). After 20 minutes, a dark brown/black material precipitated and was filtered. The solid material was dissolved in chloroform, dried over magnesium sulfate, and purified by chromatography on a HORIZON HPFC system (eluting with a gradient of methanol/dichloromethane (20:80) in dichloromethane from 0:100 to 30:70). The combined fractions were concentrated, dissolved in dichloromethane and methanol, and concentrated under reduced pressure to yield 1.18 g of 8-(3-chloropropoxy)-2-methoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine.

Part B

Potassium carbonate (530 mg, 3.84 mmol), morpholine (92 mg, 1.06 mmol), and 8-(3-chloropropoxy)-2-methoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (350 mg, 0.96 mmol) were added to 15 mL of DMF and heated to 50° C. for 18 hours. Analysis by LC/MS indicated the presence of two peaks and the reaction mixture was cooled and poured into 500 mL of deionized water. After three hours, no precipitation was observed. Sodium chloride (250 g) was added to the mixture and the mixture was stirred vigorously overnight. The precipitate was collected by filtration, dissolved in dichloromethane, and purified by chromatography on a HORIZON HPFC system (eluting with a gradient of methanol/dichloromethane (20:80) in dichloromethane from 0:100 to 40:60). The resulting material was concentrated under reduced pressure, crystallized from acetonitrile, and dried under high vacuum to yield 36 mg of 2-methoxymethyl-8-(3-morpholin-4-ylpropoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as tan crystals, mp 193-196° C.

Anal. calcd for C₂₂H₃₁N₅O₃: C, 63.90; H, 7.56; N, 16.94. Found: C, 63.58; H, 7.76; N, 17.28.

Example 555 3-{[4-Amino-2-(methoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}propyl morpholine-4-carboxylate

A second product was isolated after chromatographic purification of Example 554; 92 mg of 3-{[4-amino-2-(methoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl]oxy}propyl morpholine-4-carboxylate was isolated as pale yellow crystals, mp 173-174° C.

Anal. calcd for C₂₃H₃₁N₅O₅: C, 60.38; H, 6.83; N, 15.31. Found: C, 60.12; H, 7.09; N, 15.44.

Example 556 2-(Methoxymethyl)-8-(2-oxo-2-thiomorpholin-4-ylethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Cesium carbonate (1.7 g, 5.22 mmol, 3 eq) was added to a mixture of 4-(bromoacetyl)thiomorpholine (468 mg, 2.09 mmol, 1.2 eq, prepared according to the method described in Part C of Example 30) and 8-hydroxy-2-methoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (500 mg, 1.74 mmol, 1.0 eq) in 20 mL of DMF. The reaction mixture was heated to 70° C. and maintained for 14 hours. The reaction mixture was then cooled to ambient temperature, filtered, diluted with 50 mL of dichloromethane, concentrated under reduced pressure, and filtered to afford crude material. The crude material was purified by chromatography on a HORIZON HPFC system (eluting with a gradient of methanol/dichloromethane (20:80) in dichloromethane from 0:100 to 40:60), concentrated under reduced pressure, and crystallized from acetonitrile to afford 231 mg of 2-(methoxymethyl)-8-(2-oxo-2-thiomorpholin-4-ylethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as an off white solid, mp 214-216° C.

Anal. calcd for C₂₁H₂₇N₅O₃S: C, 58.72; H, 6.34; N, 16.30. Found: C, 58.60; H, 6.48; N, 16.41.

Example 557 2-(Methoxymethyl)-8-(2-morpholin-4-yl-2-oxoethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Cesium carbonate (1.7 g, 5.25 mmol, 3 eq) was added to a mixture of 2-bromo-1-morpholin-4-yl-ethanone (400 mg, 1.92 mmol, 1.1 eq), 8-hydroxy-2-methoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (500 mg, 1.75 mmol, 1.0 eq), and anhydrous DMF. The reaction mixture was heated to 70° C. and maintained overnight. The reaction mixture was then cooled to ambient temperature, filtered, and concentrated under reduced pressure to yield a dark oil. The dark oil was dissolved in dichloromethane, filtered, purified by chromatography on a HORIZON HPFC system (eluting with a gradient of methanol/dichloromethane (20:80) in dichloromethane from 0:100 to 40:60), and crystallized from acetonitrile to afford 356 mg of 2-(methoxymethyl)-8-(2-morpholin-4-yl-2-oxoethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as an off white powder, mp 201-204° C.

Anal. calcd for C₂₁H₂₇N₅O₄: C, 61.00; H, 6.58; N, 16.94. Found: C, 60.82; H, 6.51; N, 16.86.

Example 558 2-Methoxymethyl-8-(1-methylpiperidin-3-ylmethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Potassium carbonate (1.48 g, 10.75 mmol), 3-chloromethyl-1-methyl-piperidine hydrochloride (483 mg, 2.62 mmol), sodium iodide (100 mg, 0.66 mmol), and 8-hydroxy-2-methoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (500 mg, 1.75 mmol) were combined in acetone and heated at reflux overnight. No desired product was detected and the reaction mixture was filtered. The filtrate was concentrated under reduced pressure, dissolved in DMF, and heated at 90° C. overnight. The reaction mixture was then cooled to ambient temperature, filtered, and concentrated under reduced pressure to provide a dark oil. The oil was dissolved in dichloromethane, filtered, purified by chromatography on a HORIZON HPFC system (eluted with a gradient of CMA:chloroform from 0:100 to 35:65), and crystallized from acetonitrile to afford 160 mg of 2-methoxymethyl-8-(1-methyl-piperidin-3-yl-methoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as a tan powder, mp 194-196° C.

Anal. calcd for C₂₂H₃₁N₅O₂: C, 66.47; H, 7.86; N, 17.62. Found: C, 66.27; H, 8.15; N, 17.74.

Example 559 2-Methoxymethyl-8-(2-piperidin-1-ylethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Potassium carbonate (1.48 g, 10.75 mmol), N-(2-chloroethyl)-piperidine hydrochloride (483 mg, 2.62 mmol), sodium iodide (100 mg, 0.66 mmol), and 8-hydroxy-2-methoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (500 mg, 1.75 mmol) were combined in acetone as a slurry and heated at reflux overnight. The reaction mixture was cooled to ambient temperature and filtered. The filter cake was washed with acetone and the combined filtrate was concentrated under reduced pressure to afford a solid. The solid material was dissolved in dichloromethane and purified by chromatography on a HORIZON HPFC system (eluting with a gradient of CMA:chloroform from 0:100 to 40:60). The resulting material was concentrated under reduced pressure and crystallized from acetonitrile to afford 175 mg of 2-methoxymethyl-8-(2-piperidin-1-ylethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as tan crystals, mp 160-162° C. Anal. calcd for C₂₂H₃₁N₅O₂.0.33 CH₃CN.0.33H₂O: C, 65.18; H, 7.90; N, 17.82. Found: C, 65.18; H, 8.05; N, 18.10.

Example 560 7-[(1-Acetylpiperidin-4-yl)oxy]-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

2-(Ethoxymethyl)-7-(piperidin-4-yloxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.500 g, 1.3 mmol) was slurried in dichloromethane (13 mL). Acetic anhydride (0.122 mL, 1.3 mmol) was added dropwise to the slurry and the mixture was stirred for 36 hours. Saturated aqueous sodium carbonate (5 mL) was added and the reaction was stirred for 1 hour. The layers were separated and the organic fraction was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 1-22% CMA in chloroform). The resulting amorphous solid was triturated with boiling acetonitrile. Filtration afforded 0.270 g of 7-[(1-acetylpiperidin-4-yl)oxy]-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as an off-white solid, mp 178-179.5° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.91 (d, J=9.0 Hz, 1H), 7.13 (d, J=2.6 Hz, 1H), 6.96 (dd, J=9.0, 2.6 Hz, 1H), 6.52 (s, 2H), 4.75 (s, 2H), 4.75-4.66 (m, 1H), 4.52-4.41 (m, 2H), 3.98-3.82 (m, 1H), 3.78-3.64 (m, 1H), 3.55 (q, J=7.0 Hz, 2H), 3.44-3.16 (m, 2H), 2.09-1.77 (m, 4H), 2.03 (s, 3H), 1.74-1.45 (m, 2H), 1.16 (t, J=7.0 Hz, 3H), 1.00 (t, J=7.3 Hz, 3H);

MS (APCI) m/z 426.2 (M+H)⁺;

Anal. calcd for C₂₃H₃₁N₅O₃: C, 64.92; H, 7.34; N, 16.46. Found: C, 64.76; H, 7.64; N, 16.60.

Example 561 2-(Ethoxymethyl)-7-{[1-(methylsulfonyl)piperidin-4-yl]oxy}-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

The general method described in Example 560 was followed using methanesulfonyl chloride (0.100 mL, 1.3 mmol) in lieu of acetic anhydride. The reaction time was reduced to 2 hours. Filtration from acetonitrile afforded 0.381 g of 2-(ethoxymethyl)-7-{[1-(methylsulfonyl)piperidin-4-yl]oxy}-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as a pale yellow solid, mp 215-217° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.92 (d, J=9.0 Hz, 1H), 7.13 (d, J=2.5 Hz, 1H), 6.97 (dd, J=9.0, 2.5 Hz, 1H), 6.53 (s, 2H), 4.75 (s, 2H), 4.72-4.62 (m, 1H), 4.53-4.41 (m, 2H), 3.55 (q, J=7.0 Hz, 2H), 3.46-3.32 (m, 2H), 3.23-3.08 (m, 2H), 2.92 (s, 3H), 2.14-1.99 (m, 2H), 1.94-1.71 (m, 4H), 1.16 (t, J=7.0 Hz, 3H), 1.00 (t, J=7.4 Hz, 3H);

¹³C NMR (125 MHz, DMSO-d₆) δ 155.7, 152.3, 148.1, 147.0, 133.3, 125.0, 121.5, 112.5, 110.0, 109.0, 70.7, 65.3, 64.2, 46.7, 42.6, 34.4, 29.8, 23.0, 14.9, 10.7;

MS (APCI) m/z 462.3 (M+H)⁺;

Anal. calcd for C₂₂H₃₁N₅O₄S: C, 57.25; H, 6.77; N, 15.17; % S, 6.95. Found: C, 57.14; H, 7.04; N, 15.48; % S, 6.77.

Example 562 tert-Butyl 2-{[4-amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate

A modification of the methods described in Parts A-I of Example 2 was used to prepare 2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol, with 3-benzyloxyaniline and 1-amino-2-methylpropan-2-ol used in lieu of 4-benzyloxyaniline and propylamine, respectively.

Part A

2-(Ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol (4.0 g, 12.7 mmol) and cesium carbonate (6.20 g, 19.0 mmol) were slurried in DMF (100 mL). tert-Butyl 2-iodoethylcarbamate (4.12 g, 15.2 mmol) in DMF (27 mL) was added, and the mixture was heated to 65° C. under nitrogen. After 15 hours, the DMF was removed under reduced pressure. The residue was taken up in dichloromethane and washed repeatedly with water. The organic layer was dried over anhydrous sodium sulfate, filtered and evaporated under reduced pressure. The residue was purified by chromatography on a HORIZON HPFC system (silica gel, 2-30% CMA in chloroform) to afford, after evaporation of the solvent, 2.9 g of tert-butyl 2-{[2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate as a tan foam.

Part B

tert-Butyl 2-{[2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate (2.9 g, 6.32 mmol) was dissolved in ethyl acetate (25 mL). 32% Peracetic acid in acetic acid (1.99 mL, 9.48 mmol) was added to the solution and the mixture was heated to 50° C. for 2 hours. Another 0.5 mL of the peracetic acid solution (2.37 mmol) was added and the reaction was stirred for 1 hour. A solution of sodium metabisulfite in water (1.5 g in 3.0 mL) was added in two portions and the reaction mixture was stirred for 10 minutes. The heat was then removed and the solution was brought to pH≈10 with saturated aqueous sodium carbonate (˜15 mL). The resulting precipitate was filtered, washed with ethyl acetate (10 mL) and water (10 mL), and dried under vacuum to afford 2.8 g of tert-butyl 2-{[2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-5-oxido-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate as a white paper-like solid with some water remaining.

Part C

tert-Butyl 2-{[2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-5-oxido-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate (2.8 g, 5.05 mmol) was dissolved in dichloromethane (35 mL) and ammonium hydroxide (25 mL). p-Toluenesulfonyl chloride (0.962 g, 5.05 mmol) was added in one portion and the reaction was stirred for 16 hours. The layers were separated and the aqueous fraction was extracted with dichloromethane. The organics were combined and evaporated under reduced pressure. The residue was purified by chromatography on a HORIZON HPFC system (silica gel, 2-25% CMA in chloroform) to provide 1.95 g of tert-butyl 2-{[4-amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate as white crystals.

¹H NMR (300 MHz, DMSO-d₆) δ 8.16 (d, J=9.1 Hz, 1H), 7.06-6.98 (m, 1H), 7.02 (d, J=2.6 Hz, 1H), 6.84 (dd, J=9.0, 2.6 Hz, 1H), 6.49 (s, 2H), 5.01-4.73 (m, 1H), 4.86 (s, 2H), 4.61 (br s, 2H), 4.04 (t, J=5.8 Hz, 2H), 3.50 (q, J=7.0 Hz, 2H), 3.39-3.27 (m, 2H), 1.39 (s, 9H), 1.16 (br s, 6H), 1.13 (t, J=7.0 Hz, 3H);

MS (ESI) m/z 474.3 (M+H)⁺.

Example 563 tert-Butyl 4-{[4-amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate

Part A

2-(Ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol (3.31 g, 10.5 mmol), triphenylphosphine (3.43 g, 13.1 mmol) and tert-butyl 4-hydroxypiperidine-1-carboxylate (2.64 g, 13.1 mmol) were slurried in THF (105 mL) and cooled with an ice/water bath. Diisopropyl azodicarboxylate (2.58 mL, 13.1 mmol) was added dropwise. The cooling bath was removed and the reaction was stirred for 16 hours. The solvent was removed under reduced pressure and the residue was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 1-28% CMA in chloroform) to afford 3.32 g of tert-butyl 4-{[2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate as a tan foam.

Part B

To a stirring solution of tert-butyl 4-{[2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate (3.32 g, 6.66 mmol) in chloroform (70 mL) was added 3-chloroperoxybenzoic acid (2.29 g, 6.66 mmol, based on 50% purity). After 30 minutes, concentrated ammonium hydroxide (35 mL) was added and the reaction was stirred for 15 minutes. p-Toluenesulfonyl chloride (1.27 g, 6.66 mmol) was added in one portion and stirring was continued for 16 additional hours. The layers were separated and the organic fraction was washed with water, then saturated aqueous sodium chloride. The organic fraction was evaporated under reduced pressure and the residue was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 2-28% CMA in chloroform), followed by recrystallization from acetonitrile to afford 0.630 g of tert-butyl 4-{[4-amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate as a tan crystalline solid, mp 214-215° C., decomposition.

¹H NMR (300 MHz, DMSO-d₆) δ 8.16 (d, J=9.1 Hz, 1H), 7.07 (d, J=2.6 Hz, 1H), 6.86 (dd, J=9.1, 2.6 Hz, 1H), 6.48 (s, 2H), 5.04-4.74 (m, 1H), 4.86 (s, 2H), 4.70-4.53 (m, 3H), 3.79-3.64 (m, 2H), 3.50 (q, J=7.0 Hz, 2H), 3.28-3.12 (m, 2H), 2.04-1.88 (m, 2H), 1.67-1.47 (m, 2H), 1.41 (s, 9H), 1.16 (br s, 6H), 1.13 (t, J=7.0 Hz, 3H);

MS (ESI) m/z 514.4 (M+H)⁺;

Anal. calcd for C₂₇H₃₉N₅O₅: C, 63.14; H, 7.65; N, 13.63. Found: C, 62.79; H, 7.77; N, 13.41.

Example 564 1-[4-Amino-7-(1,3-dioxolan-2-ylmethoxy)-2-(2-methoxyethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol

[7-Benzyloxy-2-(2-methoxyethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol was prepared according to a modification of the methods described in Parts A-H of Example 2, with 3-benzyloxyaniline, 1-amino-2-methylpropan-2-ol, and 3-methoxypropanoyl chloride used in lieu of 4-benzyloxyaniline, propylamine, and ethoxyacetyl chloride, respectively. The general methods described in Parts H through J of Example 1 were used to convert [7-benzyloxy-2-(2-methoxyethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol to 4-amino-1-(2-hydroxy-2-methylpropyl)-2-(2-methoxyethyl)-1H-imidazo[4,5-c]quinolin-7-ol. A mixture of 4-amino-1-(2-hydroxy-2-methylpropyl)-2-(2-methoxyethyl)-1H-imidazo[4,5-c]quinolin-7-ol (375 mg, 1.13 mmol), 2-bromomethyl-1,3-dioxolane (208 mg, 1.24 mmol) and potassium carbonate (312 mg, 2.26 mmol) in DMF (15 mL) was heated at 70° C. overnight. The temperature was increased to 130° C. and additional 2-bromomethyl-1,3-dioxolane and potassium carbonate were added over 3 days. The reaction mixture was allowed to cool to room temperature, then was filtered to remove the solids. The filtrate was concentrated under reduced pressure and the residue was slurried in dichloromethane. Again, the solids were removed by filtration and the filtrate was concentrated under reduced pressure. Purification by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 0-35% methanol/dichloromethane (20:80) in dichloromethane) followed by recrystallization from acetonitrile provide 20 mg of 1-[4-amino-7-(1,3-dioxolan-2-ylmethoxy)-2-(2-methoxyethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol as off white crystals, mp 131.0-136.0° C.

MS (APCI) m/z 417 (M+H)⁺;

Anal. calcd for C₂₁H₂₈N₄O₅.0.58H₂O: C, 59.08; H, 6.89; N, 13.12. Found: C, 59.08; H, 7.00; N, 13.18.

Example 565 8-[2-(1,1-Dioxidothiomorpholin-4-yl)-2-oxoethoxy]-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Part A

The synthesis of 2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol is described in Parts A-I of Example 2. A mixture of 2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol (1.0 g, 3.5 mmol), 4-(bromoacetyl)thiomorpholine (941 mg, 4.2 mmol, prepared from thiomorpholine according to the method described in Part C of Example 30), and cesium carbonate (3.4 g, 10.5 mmol) in DMF was heated at 70° C. for 6 hours, then at 50° C. overnight. The reaction was allowed to cool to room temperature and the solids were removed by filtration. The filtrate was concentrated under reduced pressure and the residue was treated with dichloromethane. More solids were removed by filtration. The filtrate was used in the next step.

Part B

The filtrate from Part A was diluted with dichloromethane (400 mL). mCPBA (60% pure, 3.50 g, 12.3 mmol) was added in portions to the stirred solution. After 5 hours, concentrated ammonium hydroxide (200 mL) was added in two portions. The mixture was stirred vigorously as p-toluenesulfonyl chloride (805 mg, 4.2 mmol) was added over 10 minutes. After 1 hour, the mixture was transferred to a separatory funnel and the layers were separated. The organic layer was washed with 1% aqueous sodium carbonate (2×100 mL). The aqueous layers were combined and extracted with chloroform (6×100 mL). The organic layers were combined, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 0-35% CMA in chloroform) then recrystallized from acetonitrile to provide 80 mg of 8-[2-(1,1-dioxidothiomorpholin-4-yl)-2-oxoethoxy]-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as an off white solid, mp 223.0-225.0° C.

MS (APCI) m/z 476 (M+H)⁺;

Anal. calcd for C₂₂H₂₉N₅O₅S: C, 55.56; H, 6.15; N, 14.73. Found: C, 55.45; H, 6.14; N, 15.08.

Example 566 2-(Ethoxymethyl)-8-(2-morpholin-4-yl-2-oxoethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Part A

mCPBA (60% pure, 27.5 g, 95.9 mmol) was added in small portions over a period of 20 minutes to 8-benzyloxy-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinoline (30.0 g, 79.9 mmol, prepared in Parts A through H of Example 2) in dichloromethane (400 mL). After the reaction was stirred for two hours, it was washed with 1% aqueous sodium carbonate (3×100 mL). The combined aqueous washings were extracted with chloroform (200 mL), and the combined organic fractions were dried over magnesium sulfate and filtered. Trichloroacetyl isocyanate (18.0 g, 95.9 mmol) was added dropwise to the filtrate, and then the reaction was stirred overnight at ambient temperature. Concentrated ammonium hydroxide (100 mL) was slowly added, and the mixture was stirred at ambient temperature for 30 minutes. The organic layer was separated and washed with 1% aqueous sodium carbonate (2×100 mL). The combined aqueous fractions were extracted with chloroform (3×75 mL). The organic fractions were combined, dried over magnesium sulfate, filtered, and concentrated under reduced pressure to yield a dark semi-solid. The crude product was purified on silica gel (1 kg, eluting sequentially with 2% methanol in chloroform and 5% methanol in chloroform) to provide 22 g of 8-benzyloxy-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as an off-white solid.

Part B

A dispersion of 8-benzyloxy-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (22.0 g, 56.3 mmol) and 10% palladium on carbon (7.5 g) in 50:50 ethanol/methanol (300 mL) was shaken under hydrogen pressure on a Parr apparatus at 50 psi (3.4×10⁵ Pa) for three days. The reaction mixture was filtered to remove the catalyst, which was washed with hot ethanol/methanol (3 L). The filtrate was concentrated under reduced pressure. The resulting solid was triturated with methanol and isolated by filtration to provide 10.4 g of 4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol as an off-white solid.

Part C

Cesium carbonate (1.62 g, 5.00 mmol) was added to a solution of 2-bromo-1-morpholin-4-yl-ethanone (414 mg, 1.99 mmol), 4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol (500 mg, 1.66 mmol), and anhydrous DMF (20 mL). The reaction mixture was heated at 75° C. overnight, allowed to cool, and poured into deionized water (300 mL). The resulting mixture was stirred for 30 minutes and then extracted with chloroform (3×100 mL). The combined organic fractions were dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting solid was purified by chromatography on a HORIZON HPFC system (silica cartridge, eluting with a gradient of 0-35% methanol/dichloromethane (10:90) in dichloromethane). The resulting solid was recrystallized from acetonitrile to yield 333 mg of 2-(ethoxymethyl)-8-(2-morpholin-4-yl-2-oxoethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as an off-white solid, mp 196-197° C. Anal. calcd for C₂₂H₂₉N₅O₄: C, 61.81; H, 6.84; N, 16.38. Found: C, 61.72; H, 6.86; N, 16.62.

Example 567 2-(Methoxymethyl)-8-[2-(1-methylpyrrolidin-2-yl)ethoxy]-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

Potassium carbonate (1.48 g, 10.75 mmol), 2-(2-chloroethyl)-1-methylpyrrolidine hydrochloride (483 mg, 2.62 mmol), sodium iodide (100 mg, 0.66 mmol), and 8-hydroxy-2-methoxymethyl-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (500 mg, 1.75 mmol) were combined in acetone and heated at reflux overnight. Additional 2-(2-chloroethyl)-1-methylpyrrolidine hydrochloride and potassium carbonate were added, and the reaction was heated at reflux overnight. The reaction mixture was then cooled to ambient temperature, filtered, and concentrated under reduced pressure. The residue was purified by chromatography on a HORIZON HPFC system (silica cartridge, eluting with a gradient of CMA:chloroform from 0:100 to 25:75) followed by recrystallization from acetonitrile to afford 105 mg of 2-methoxymethyl-8-[2-(1-methylpyrrolidin-2-yl)ethoxy]-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as an off-white solid, mp 155-157° C. Anal. calcd for C₂₂H₃₁N₅O₂.0.25H₂O: C, 65.66; H, 7.90; N, 17.40. Found: C, 65.66; H, 8.24; N, 17.26.

Example 568 2-Ethyl-7-(2-morpholin-4-ylethoxy)-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine

Cesium carbonate (1.41 g, 4.32 mmol) was added to a solution of 4-(2-chloroethyl)morpholine hydrochloride (348 mg, 1.87 mmol) and 4-amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-ol (471 mg, 1.44 mmol, prepared in Parts A and B of Example 553) in anhydrous DMF (25 mL). The reaction mixture was heated at 75° C. overnight, allowed to cool, and poured into 1% aqueous sodium carbonate (300 mL). The resulting mixture was stirred for two hours and then extracted with chloroform (4×100 mL). The combined organic fractions were dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting solid was purified by chromatography on a HORIZON HPFC system (silica cartridge, eluting with a gradient of 0-40% methanol/dichloromethane (20:80) in dichloromethane). The resulting solid was recrystallized from acetonitrile and dried under vacuum to yield 393 mg of 2-ethyl-7-(2-morpholin-4-ylethoxy)-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine as an off-white solid, mp 230-232° C. Anal. calcd for C₂₄H₃₃N₅O₃: C, 65.58; H, 7.57; N, 15.93. Found: C, 65.48; H, 7.39; N, 15.91.

Example 569 2-(Ethoxymethyl)-1-propyl-8-(tetrahydrofuran-2-ylmethoxy)-1H-imidazo[4,5-c]quinolin-4-amine

Cesium carbonate (1.62 g, 5.00 mmol) was added to a solution of tetrahydrofurfuryl bromide (330 mg, 1.99 mmol) and 4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol (500 mg, 1.66 mmol, prepared in Parts A and B of Example 566) in anhydrous DMF (20 mL). The reaction mixture was heated at 75° C. overnight, allowed to cool, and poured into deionized water (300 mL). After 30 minutes of stirring, a brown precipitate formed. Sodium chloride (100 g) was added, and the resulting mixture was stirred for three hours and then filtered. The isolated precipitate was purified by chromatography on a HORIZON HPFC system (silica cartridge, eluting with a gradient of 0-35% methanol/dichloromethane (10:90) in dichloromethane). The resulting solid was recrystallized from acetonitrile and dried under high vacuum to yield 429 mg of 2-(ethoxymethyl)-1-propyl-8-(tetrahydrofuran-2-ylmethoxy)-1H-imidazo[4,5-c]quinolin-4-amine as a fluffy, white solid, mp 178-179° C. Anal. calcd for C₂₁H₂₈N₄O₃.0.25H₂O: C, 64.84; H, 7.39; N, 14.40. Found: C, 65.03; H, 7.75; N, 14.48.

Example 570 4-Amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl morpholine-4-carboxylate

Cesium carbonate (1.62 g, 5.00 mmol) was added to a solution of 4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol (500 mg, 1.66 mmol, prepared in Parts A and B of Example 566) in anhydrous DMF (30 mL). The reaction was stirred for ten minutes, and 4-morpholinecarbonyl chloride (275 mg, 1.83 g) was then added. The reaction was stirred overnight at ambient temperature and poured into deionized water (300 mL). The resulting mixture was stirred for one hour and then extracted with chloroform (3×100 mL). The combined organic fractions were concentrated under reduced pressure, and the resulting solid was purified by chromatography on a HORIZON HPFC system (silica cartridge, eluting with a gradient of 0-20% CMA in chloroform). The resulting solid was recrystallized from acetonitrile and dried under vacuum to yield 606 mg of 4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-yl morpholine-4-carboxylate as a white, crystalline solid, mp 193-196° C. Anal. calcd for C₂₁H₂₇N₅O₄: C, 61.00; H, 6.58; N, 16.94. Found: C, 61.01; H, 6.51; N, 17.21.

Example 571 8-(2-Azepan-1-ylethoxy)-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

The preparation and purification methods described in Part C of Example 566 were followed, using 1-(2-chloroethyl)azepane hydrochloride (395 mg, 1.99 mmol) in lieu of 2-bromo-1-morpholin-4-ylethanone, to provide 275 mg of 8-(2-azepan-1-ylethoxy)-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as an off-white, crystalline solid, mp 146-148° C. Anal. calcd for C₂₄H₃₅N₅O₂: C, 67.74; H, 8.29; N, 16.46. Found: C, 67.49; H, 8.47; N, 16.43.

Examples 572-645 Part A

A reagent (0.11 mmol, 1.1 equivalents) from the table below was added to a test tube containing a solution of 7-(3-aminopropoxy)-2-(2-methoxyethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (36 mg, 0.10 mmol, prepared as described in Example 394) and triethylamine (0.028 mL, 0.20 mmol) in N,N-dimethylacetamide (1 mL). The test tubes were capped and shaken overnight at room temperature. The solvent was removed by vacuum centrifugation. The reaction mixtures were separated by solid-supported liquid-liquid extraction according to the following procedure. Each sample was dissolved in chloroform (1 mL) and loaded onto diatomaceous earth that had been treated with 600 μL of deionized water for 20 minutes. After ten minutes, chloroform (500 μL) was added to elute the product from the diatomaceous earth into a well of a collection plate. After an additional ten minutes, the process was repeated with additional chloroform (500 μL). The solvent was then removed by vacuum centrifugation.

Part B

Dichloromethane (1 mL) was added to test tubes containing the reaction mixtures from Part A, and the resulting mixtures were sonicated until all solids were dissolved. The resulting solutions were cooled to 0° C., and a solution of 1 M boron tribromide in dichloromethane (130 μL, 0.13 mmol) was added to each test tube, which was maintained at 0° C. for 30 minutes and then shaken on a vortexer for 2.5 hours. Methanol (0.5 mL) and 6 M aqueous hydrochloric acid (500 μL) were added to each test tube; each tube was shaken on a vortexer for 30 minutes. The volatiles were removed by vacuum centrifugation, and the compounds were purified by prepHPLC using the method described in Examples 376-386. The table below shows the reagent added to each test tube, the structure of the resulting compound, and the observed accurate mass for the isolated trifluoroacetate salt.

Ex- Measured am- Mass ple Reagent R (M + H) 572 None—starting material only

344.2116 573 Propionyl chloride

400.2354 574 Methyl chloroformate

402.2151 575 Cyclopropanecarbony chloride

412.2344 576 Butyryl chloride

414.2487 577 Isobutyryl chloride

414.2506 578 Ethyl chloroformate

416.2283 579 Methoxyacetyl chloride

402.2147 580 Cyclobutanecarbonyl chloride

426.2477 581 Isovaleryl chloride

428.2657 582 Pivaloyl chloride

428.2662 583 Cyclopentylacetyl chloride

440.2642 584 Isobutyl chloroformate

444.2586 585 Benzoyl chloride

448.2395 586 Cyclohexanecarbonyl chloride

454.2772 587 m-Toluoyl chloride

462.2513 588 o-Toluoyl chloride

462.2517 589 p-Toluoyl chloride

462.2544 590 Phenylacetyl chloride

462.2515 591 2-luorobenzoyl chloride

466.2296 592 4-luorobenzoyl chloride

466.2259 593 4-Cyanobenzoyl chloride

473.2291 594 Cinnamoyl chloride

474.2477 595 Hydrocinnamoyl chloride

476.2686 596 2-Chlorobenzoyl chloride

482.1996 597 3-Chlorobenzoyl chloride

482.1943 598 4-Chlorobenzoyl chloride

482.1992 599 Isonicotinoyl chloride hydrochloride

449.2347 600 Nicotinoyl chloride hydrochloride

449.2321 601 Picolinoyl chloride hydrochloride

449.2292 602 trans-2-Phenyl-1- Cyclopropanecarbonyl chloride

488.2635 603 4- Dimethylaminobenzoyl chloride

491.2744 604 4-Chlorophenylacetyl chloride

496.2112 605 Methanesulfonyl chloride

422.1879 606 Ethanesulfonyl chloride

436.2013 607 1-Propanesulfonyl chloride

450.2137 608 Isopropylsulfonyl chloride

450.2165 609 Dimethylsulfamoyl chloride

451.2091 610 1-Butanesulfonyl chloride

464.2363 611 Benzenesulfonyl chloride

484.2063 612 alpha-Toluenesulfonyl chloride

498.2151 613 2- Methylbenzenesulfonyl chloride

498.2155 614 4- Methylbenzenesulfonyl chloride

498.2207 615 4- Fluorobenzenesulfonyl chloride

502.1945 616 beta-Styrenesulfonyl chloride

510.2184 617 3,5- Dimethylbenzene- sulfonyl chloride

512.2330 618 2- Chlorobenzenesulfonyl chloride

518.1660 619 3- Chlorobenzenesulfonyl chloride

518.1663 620 1-Naphthalenesulfonyl chloride

534.2173 621 2-Naphthalenesulfonyl chloride

534.2125 622 8-Quinolinesulfonyl chloride

535.2122 623 2-(Trifluoromethyl) benzenesulfonyl chloride

552.1940 624 3-(Trifluoromethyl) benzenesulfonyl chloride

552.1906 625 4-(Trifluoromethyl) benzenesulfonyl chloride

552.1903 626 Ethyl isocyanate

415.2448 627 N-Butyl isocyanate

443.2809 628 sec-Butyl isocyanate

443.2796 629 Cyclopentyl isocyanate

455.2740 630 Pentyl isocyanate

457.2888 631 Phenyl isocyanate

463.2447 632 m-Tolyl isocyanate

477.2644 633 o-Tolyl isocyanate

477.2613 634 p-Tolyl isocyanate

477.2592 635 2,6-Dimethylphenyl isocyanate

491.2792 636 (R)-(+)-alpha- Methylbenzyl isocyanate

491.2758 637 (S)-(−)-alpha- Methylbenzyl isocyanate

491.2758 638 2-Phenyl ethylisocyanate

491.2752 639 2-(Thien-2-yl)ethyl isocyanate

497.2327 640 4-Chlorophenyl isocyanate

497.2092 641 trans-2- Phenylcyclopropyl isocyanate

503.2795 642 N,N- Dimethylcarbamoyl chloride

415.2455 643 1-Piperidinecarbonyl chloride

455.2752 644 4-Methyl-1- piperazinecarbonyl chloride

470.2906 645 N-Methyl-N- phenylcarbamoyl chloride

477.2604

Example 646 1-[4-Amino-2-(ethoxymethyl)-7-(2-morpholin-4-yl-2-oxoethoxy)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol

Part A

A modification of the methods described in Parts A-H of Example 2 was used to prepare 1-[7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol, with 3-benzyloxyaniline and 1-amino-2-methylpropan-2-ol used in lieu of 4-benzyloxyaniline and propylamine, respectively. Modification on the methods described in steps M, N, and I of Example 2 were used to convert 1-[7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol into 4-amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol.

Part B

A mixture of 4-amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol (prepared as described above, 750 mg, 2.27 mmol), 4-(bromoacetyl)morpholine (565 mg, 2.72 mmol), and cesium carbonate (2.22 g, 6.81 mmol) in DMF (30 mL) was heated at 75° C. overnight. The reaction mixture was allowed to cool and was poured into water (300 mL). After 30 minutes, the solution was extracted with chloroform (6×75 mL). The organic layers were combined, dried over magnesium sulfate, filtered, and concentrated to dryness. The resulting solid was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 0-35% methanol/dichloromethane (1:10) in dichloromethane) The appropriate fractions were combined and concentrated to yield an off white solid that was slurried in boiling acetonitrile for 15 minutes. The slurry was allowed to cool with stirring. The solid was isolated by filtration and dried to yield 797 mg of 1-[4-amino-2-(ethoxymethyl)-7-(2-morpholin-4-yl-2-oxoethoxy)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol as an off-white solid, mp 209-211° C.

MS (ESI) m/z 458 (M+H)⁺;

Anal. calcd for C₂₃H₃₁N₅O₅: C, 60.38; H, 6.83; N, 15.31. Found: C, 60.25; H, 7.12; N, 15.50.

Example 647 1-[4-Amino-2-(ethoxymethyl)-7-(2-morpholin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol

The general procedure described in Example 646 was used to convert 4-amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol (prepared as described in Part A of Example 646, 750 mg, 2.27 mmol) into 1-[4-amino-2-(ethoxymethyl)-7-(2-morpholin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol with 4-(2-chloroethyl)morpholine hydrochloride (506 mg, 2.72 mmol) used in lieu of 4-(bromoacetyl)morpholine. The product was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 0-25% CMA in chloroform). The appropriate fractions were combined and concentrated to yield a white foam that was crystallized from acetonitrile to provide 275 mg of 1-[4-amino-2-(ethoxymethyl)-7-(2-morpholin-4-ylethoxy)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol as an off-white crystalline solid, mp 161-163° C.

MS (ESI) m/z 444 (M+H)⁺;

Anal. calcd for C₂₃H₃₃N₅O₄: C, 62.28; H, 7.50; N, 15.79. Found: C, 62.15; H, 7.70; N, 16.01.

Example 648 2-(Ethoxymethyl)-7-(2-morpholin-4-yl-2-oxoethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

A modification on the procedure described in Example 646 was used to convert 4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol (prepared as described in Parts A and B of Example 51) into 2-(ethoxymethyl)-7-(2-morpholin-4-ylethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine. The reaction mixture was heated overnight then was poured slowly into water. After the mixture was stirred for 1 hour, a tan solid was isolated by filtration and recrystallized from acetonitrile to afford 2-(ethoxymethyl)-7-(2-morpholin-4-yl-2-oxoethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine as off-white crystals, mp 213° C.

MS (APCI) m/z 428 (M+H)⁺;

Anal. calcd for C₂₂H₂₉N₅O₄: C, 61.81; H, 6.84; N, 16.38. Found: C, 61.61; H, 7.17; N, 16.51.

Example 649 2-(Ethoxymethyl)-7-(2-morpholin-4-ylethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine

A modification on the procedure described in Example 647 was used to convert 4-amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-7-ol (prepared as described in Parts A and B of Example 51) into 2-(ethoxymethyl)-7-(2-morpholin-4-ylethoxy)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine. The reaction mixture was heated overnight and then was poured slowly into water. The mixture was stirred for 1 hour and a tan solid was isolated by filtration and recrystallized from acetonitrile to afford off-white crystals, mp 191-192° C.

MS (APCI) m/z 414.3 (M+H)⁺;

Anal. calcd for C₂₂H₃₁N₅O₃: C, 63.90; H, 7.56; N, 16.94. Found: C, 63.76; H, 7.48; N, 16.83.

Example 650 7-(2-Aminoethoxy)-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine

7-(2-Aminoethoxy)-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine dihydrochloride (prepared as described in Example 552, 0.100 g) was dissolved in water (5 mL) and saturated aqueous sodium chloride (5 mL). The solution was brought to pH 13 with 50% aqueous sodium hydroxide and extracted with chloroform. The chloroform was washed successively with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered and concentrated. The residue was recrystallized from acetonitrile to provide 0.065 g of 7-(2-aminoethoxy)-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine as a white crystalline solid, mp 238° C. (decomposition).

¹H NMR (300 MHz, DMSO-d₆) δ 7.91 (d, J=9.0 Hz, 1H), 7.05 (d, J=2.6 Hz, 1H), 6.92 (dd, J=9.0, 2.6 Hz, 1H), 6.32 (s, 2H), 4.38-4.37 (m, 2H), 3.99 (t, J=5.8 Hz, 2H), 3.83-3.79 (m, 2H), 3.17-3.12 (m, 2H), 2.93-2.89 (m, 4H), 2.12-2.01 (m, 1H), 1.58-1.38 (m, 6H), 1.36 (t, J=7.4 Hz, 3H);

MS (ESI) m/z 370.2 (M+H)⁺;

Anal. calcd for C₂₀H₂₇N₅O₂: C, 65.02; H, 7.37; N, 18.96. Found: C, 64.79; H, 7.32; N, 18.96.

Example 651 N-(2-{[4-Amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)-N′-isopropylurea

7-(2-Aminoethoxy)-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine dihydrochloride (0.480 g, 1.03 mmol; prepared as in Example 552), dichloromethane (10 mL), and triethylamine (0.702 mL, 5.03 mmol) were combined and stirred for 10 minutes. Isopropyl isocyanate (0.101 mL, 1.03 mmol) was added dropwise and the reaction was stirred for 16 hours. Saturated aqueous sodium carbonate (˜5 mL) was added and the reaction was stirred for 10 minutes. The layers were separated. The organic fraction was washed with water and then concentrated under reduced pressure. The resulting crude product was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution of 2-20% CMA in chloroform) followed by recrystallization from acetonitrile to provide 0.390 g of N-(2-{[4-amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)-N′-isopropylurea as a white solid, mp 223-225° C.

¹H NMR (300 MHz, DMSO-d₆) δ 7.92 (d, J=9.1 Hz, 1H), 7.06 (d, J=2.6 Hz, 1H), 6.92 (dd, J=9.0, 2.6 Hz, 1H), 6.38 (s, 2H), 5.95 (t, J=5.6 Hz, 1H), 5.83 (d, J=7.6 Hz, 1H), 4.39-4.36 (m, 2H), 4.03 (t, J=5.8 Hz, 2H), 3.84-3.79 (m, 2H), 3.73-3.62 (m, 1H), 3.45-3.36 (m, 2H), 3.21-3.09 (m, 2H), 2.91 (q, J=7.4 Hz, 2H), 2.13-1.97 (m, 1H), 1.56-1.36 (m, 4H), 1.36 (t, J=7.4 Hz, 3H), 1.03 (d, J=6.5 Hz, 6H);

¹³C NMR (125 MHz, DMSO-d₆) δ 157.3, 157.0, 153.7, 152.0, 146.6, 132.9, 125.1, 121.2, 111.4, 109.2, 108.3, 67.2, 66.6, 49.6, 40.8, 38.7, 35.7, 29.6, 23.2, 20.1, 12.1;

MS (ESI) m/z 455.2 (M+H)⁺;

Anal. calcd for C₂₄H₃₄N₆O₃.0.08H₂O.0.04CH₂Cl₂: C, 62.85; H, 7.51; N, 18.29. Found: C, 62.72; H, 7.69; N, 18.16.

Example 652 N-(2-{[4-Amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)acetamide

7-(2-Aminoethoxy)-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine dihydrochloride (0.480 g, 1.03 mmol; prepared as in Example 552), dichloromethane (10 mL), and triethylamine (0.430 mL, 3.09 mmol) were combined and stirred for 10 minutes. Acetic anhydride (0.097 mL, 1.03 mmol) was added and the reaction was stirred for an additional 16 hours. The reaction mixture was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 2-20% CMA in chloroform). Fractions containing product were combined and concentrated. Trituration of the product in acetonitrile provided 0.319 g of N-(2-{[4-amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)acetamide as fine white crystals, mp 165-167° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.12 (t, J=5.4 Hz, 1H), 7.92 (d, J=9.1 Hz, 1H), 7.06 (d, J=2.7 Hz, 1H), 6.92 (dd, J=9.0, 2.7 Hz, 1H), 6.40 (s, 2H), 4.39-4.37 (m, 2H), 4.07 (t, J=5.6 Hz, 2H), 3.84-3.79 (m, 2H), 3.45 (q, J=5.6 Hz, 2H), 3.20-3.08 (m, 2H), 2.91 (q, J=7.4 Hz, 2H), 2.13-1.98 (m, 1H), 1.84 (s, 3H), 1.54-1.34 (m, 4H), 1.36 (t, J=7.4 Hz, 3H);

¹³C NMR (125 MHz, DMSO-d₆) δ 169.4, 157.0, 153.7, 152.0, 146.6, 133.0, 125.1, 121.2, 111.5, 109.2, 108.2, 66.6, 66.2, 49.6, 38.3, 35.7, 29.6, 22.5, 20.1, 12.1;

MS (APCI) m/z 412.2 (M+H)⁺;

Anal. calcd for C₂₂H₂₉N₅O₃.0.33CH₃CN: C, 64.03; H, 7.11; N, 17.56. Found: C, 63.67; H, 7.17; N, 17.41.

Example 653 N-(2-{[4-Amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)methanesulfonamide

7-(2-Aminoethoxy)-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine dihydrochloride (0.450 g, 0.97 mmol; prepared as in Example 552), dichloromethane (10 mL), and triethylamine (0.418 mL, 3.00 mmol) were combined and then stirred for 10 minutes. Methanesulfonyl chloride (0.075 mL, 0.97 mmol) was added and the reaction was stirred for an additional 16 hours. The reaction mixture was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 2-20% CMA in chloroform) followed by recrystallization from acetonitrile to provide 0.173 g of N-(2-{[4-amino-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)methanesulfonamide as white needles.

¹H NMR (300 MHz, DMSO-d₆) δ 7.93 (d, J=9.0 Hz, 1H), 7.31 (t, J=5.7 Hz, 1H), 7.07 (d, J=2.6 Hz, 1H), 6.93 (dd, J=9.0, 2.6 Hz, 1H), 6.40 (s, 2H), 4.44-4.34 (m, 2H), 4.12 (t, J=5.5 Hz, 2H), 3.87-3.77 (m, 2H), 3.44-3.35 (m, 2H), 3.21-3.08 (m, 2H), 2.98 (s, 3H), 2.91 (q, J=7.4 Hz, 2H), 2.12-1.98 (m, 1H), 1.55-1.34 (m, 4H), 1.36 (t, J=7.4 Hz, 3H);

¹³C NMR (125 MHz, DMSO-d₆) δ 156.8, 153.8, 152.0, 146.5, 132.9, 125.1, 121.3, 111.4, 109.3, 108.2, 66.8, 66.6, 49.6, 41.9, 35.7, 29.6, 20.1, 12.1;

MS (APCI) m/z 448.2 (M+H)⁺;

Anal. calcd for C₂₁H₂₉N₅O₄S.1.5H₂O: C, 53.15; H, 6.80; N, 14.76; S, 6.76. Found: C, 53.10; H, 6.53; N, 14.95; S, 6.75.

Example 654 1-[4-Amino-7-(2-aminoethoxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol

Part A

tert-Butyl 2-{[4-amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethylcarbamate (1.95 g, 4.12 mmol; prepared in Example 562) was slurried in 4.0 M ethanolic hydrogen chloride (15 mL). The reaction was heated at 65° C. for 1.75 hours during which time the starting material dissolved and a precipitate subsequently formed. The reaction mixture was cooled to ambient temperature and the solid was filtered, washed with ethanol, and dried to provide 1.49 g of 1-[4-amino-7-(2-aminoethoxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol dihydrochloride as an off-white powder.

Part B

The filtrate from Part A was evaporated and the resulting residue was dissolved in water (5 mL) and saturated aqueous sodium chloride (5 mL). This solution was brought to pH 13 with 50% aqueous sodium hydroxide and extracted with chloroform. The chloroform was sequentially washed with water, saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and concentrated. Recrystallization from acetonitrile and drying provided 0.140 g of 1-[4-amino-7-(2-aminoethoxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol as fine white crystals, mp 163-165° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.16 (d, J=9.1 Hz, 1H), 7.03 (d, J=2.7 Hz, 1H), 6.85 (dd, J=9.0, 2.7 Hz, 1H), 6.48 (s, 2H), 5.06-4.76 (m, 1H), 4.87 (s, 2H), 4.62 (br s, 2H), 3.99 (t, J=5.7 Hz, 2H), 3.50 (q, J=7.0 Hz, 2H), 2.91 (t, J=5.7 Hz, 2H), 1.60 (br s, 2H), 1.16 (br s, 6H), 1.13 (t, J=7.0 Hz, 3H);

¹³C NMR (125 MHz, DMSO-d₆) δ 157.4, 152.2, 150.0, 147.1, 134.6, 124.7, 122.4, 111.0, 109.3, 107.9, 70.6, 70.0, 65.2, 64.9, 54.7, 41.0, 27.6, 15.0;

MS (ESI) m/z 374.22 (M+H)⁺;

Anal. calcd for C₁₉H₂₇N₅O₃.0.3H₂O: C, 60.24; H, 7.34; N, 18.49. Found: C, 60.42; H, 7.32; N, 18.76.

Example 655 N-(2-{[4-Amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)-N′-isopropylurea

1-[4-Amino-7-(2-aminoethoxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol dihydrochloride (prepared as described in Part A of Example 654, 0.466 g, 1.00 mmol), dichloromethane (10 mL), and triethylamine (0.418 mL, 3.0 mmol) were combined. The mixture was stirred for 10 minutes. Isopropyl isocyanate (0.097 mL, 1.00 mmol) was added and the reaction was stirred for 16 hours. Saturated aqueous sodium carbonate (˜8 mL) was added and the layers were separated. The organic layer was concentrated and purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 2-25% CMA in chloroform). The fractions containing product were combined and concentrated. Trituration of the product in dichloromethane, followed by filtration provided 0.319 g of N-(2-{[4-amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}ethyl)-N′-isopropylurea as an off-white powder.

¹H NMR (300 MHz, DMSO-d₆) δ 8.17 (d, J=9.1 Hz, 1H), 7.04 (d, J=2.6 Hz, 1H), 6.86 (dd, J=9.1, 2.6 Hz, 1H), 6.51 (s, 2H), 5.95 (t, J=5.6 Hz, 1H), 5.83 (d, J=7.7 Hz, 1H), 5.00-4.77 (m, 1H), 4.87 (s, 2H), 4.62 (br s, 2H), 4.02 (t, J=5.5 Hz, 2H), 3.77-3.59 (m, 1H), 3.50 (q, J=7.0 Hz, 2H), 3.43-3.37 (m, 2H), 1.16 (br s, 6H), 1.13 (t, J=7.0 Hz, 3H), 1.03 (d, J=6.5 Hz, 6H);

¹³C NMR (125 MHz, DMSO-d₆) δ 157.3, 157.2, 152.3, 150.0, 147.1, 134.5, 124.8, 122.5, 110.8, 109.5, 108.0, 70.6, 67.2, 65.2, 64.9, 54.7, 40.8, 38.7, 27.6, 23.2, 15.0;

MS (ESI) m/z 459.2 (M+H)⁺;

Anal. calcd for C₂₃H₃₄N₆O₄.2.0H₂O: C, 55.86; H, 7.75; N, 16.99. Found: C, 55.63; H, 7.56; N, 16.94.

Example 656 1-[7-[(1-Acetylpiperidin-4-yl)oxy]-4-amino-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol

Part A

tert-Butyl 4-{[4-amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate (0.580 g, 1.13 mmol; prepared in Example 563) was taken up in 4.0 M ethanolic hydrogen chloride (5 mL). The reaction was heated at 65° C. for 1 hour, and then cooled to ambient temperature. The ethanol was removed under reduced pressure and the residue was dissolved in water (3 mL) and saturated aqueous sodium chloride (7 mL). The solution was adjusted to pH 13 with 50% aqueous sodium hydroxide and then extracted with chloroform. The combined organic fractions were sequentially washed with water and saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered and concentrated. Trituration with acetonitrile yielded 0.467 g of 1-[4-amino-2-(ethoxymethyl)-7-(piperidin-4-yloxy)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol as an off-white solid.

Part B

1-[4-Amino-2-(ethoxymethyl)-7-(piperidin-4-yloxy)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol (from Part A) was slurried in dichloromethane (11 mL). Acetic anhydride (0.105 mL, 1.03 mmol) was added and the reaction was stirred for 16 hours. The reaction mixture was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 2-25% CMA in chloroform). The resulting solid was covered with diethyl ether for one week. Filtration of the solid provided 0.130 g of 1-[7-[(1-acetylpiperidin-4-yl)oxy]-4-amino-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol as red-tan crystals, mp 162-164° C.

¹H NMR (300 MHz, DMSO-d₆) δ 8.16 (d, J=9.1 Hz, 1H), 7.09 (d, J=2.5 Hz, 1H), 6.87 (dd, J=9.0, 2.5 Hz, 1H), 6.47 (s, 2H), 5.04-4.77 (m, 1H), 4.86 (s, 2H), 4.75-4.61 (m, 1H), 4.61 (br s, 2H), 3.98-3.82 (m, 1H), 3.79-3.63 (m, 1H), 3.50 (q, J=7.0 Hz, 2H), 3.43-3.14 (m, 2H), 2.02 (s, 3H), 2.02-1.87 (m, 2H), 1.74-1.44 (m, 2H), 1.16 (br s, 6H), 1.13 (t, J=7.0 Hz, 3H);

MS (APCI) m/z 456.3 (M+H)⁺;

Anal. calcd for C₂₄H₃₃N₅O₄: C, 63.28; H, 7.30; N, 15.37. Found: C, 63.13; H, 7.63; N, 15.48.

Example 657 2-(Methoxymethyl)-1-propyl-8-[3-(4-pyridin-2-ylpiperazin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-4-amine

Part A

8-(3-Chloropropoxy)-2-(methoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine was prepared using a modification on the procedure described in Parts A-E of Examples 523-550. In the work-up of Part E, the reaction mixture was allowed to cool to room temperature and was poured into water. A pale brown solid, crude 8-(3-chloropropoxy)-2-(methoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine, was isolated by filtration and was used in the next step without purification.

Part B

A mixture of 8-(3-chloropropoxy)-2-(methoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-4-amine (0.20 g, 0.55 mmol, 1 equivalent), potassium carbonate (4 equivalents), and 1-(2-pyridyl)piperazine (1.1 equivalents) in DMF (5 mL) was heated at 70° C. overnight. The reaction mixture was allowed to cool to room temperature and was poured onto ice (50 g). After the mixture was stirred for 3 hours, a brown solid was isolated by filtration. The crude product was purified by chromatography on a HORIZON HPFC system (silica gel, gradient elution with 0-30% CMA in chloroform), followed by recrystallization from acetonitrile to afford 0.065 g of 2-(methoxymethyl)-1-propyl-8-[3-(4-pyridin-2-ylpiperazin-1-yl)propoxy]-1H-imidazo[4,5-c]quinolin-4-amine as off white crystals, mp 196-197° C.

MS (APCI) m/z 490 (M+H)⁺;

Anal. calcd for C₂₇H₃₅N₇O₂.0.33H₂O: C, 65.44; H, 7.25; N, 19.78. Found: C, 65.42; H, 7.28; N, 19.63.

Examples 658-661

The general method described in Example 647 can be applied to prepare Examples 658-661, whose structure and names are shown in the table below, from 4-(2-chloroethyl)morpholine hydrochloride and the starting materials listed in the table below. The starting materials can be prepared using known methods. 4-Amino-2-(ethoxymethyl)-1-propyl-1H-imidazo[4,5-c]quinolin-8-ol can be prepared as described in Parts A-B of Example 566. 4-Amino-2-ethyl-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol can be prepared using the methods described in Parts A-J of Example 1, using 1-amino-2-methylpropan-2-ol in lieu of isobutylamine in Part E and triethyl orthopropionate in lieu of trimethyl orthobutyrate in Part G. 4-Amino-2-ethyl-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-8-ol can be prepared using the methods described in Parts A-J of Example 1, using 4-benzyloxyaniline in lieu of 3-benzyloxyaniline in Part A, 1-amino-2-methylpropan-2-ol in lieu of isobutylamine in Part E, and triethyl orthopropionate in lieu of trimethyl orthobutyrate in Part G. A modification of the methods described in Parts A-H, M, N, and I of Example 2 can be used to prepare 4-amino-2-(ethoxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-8-ol, with 1-amino-2-methylpropan-2-ol used in lieu of propylamine in Part E.

Starting Example Structure Name Material 658

2-(Ethoxymethyl)- 8-(2-morpholin-4- ylethoxy)-1-propyl- 1H-imidazo[4,5- c]quinolin-4-amine 4-Amino-2- (ethoxymethyl)- 1-propyl-1H- imidazo[4,5- c]quinolin-8-ol 659

1-[4-Amino-2- ethyl-7-(2- morpholin-4- ylethoxy)-1H- imidazo[4,5- c]quinolin-1-yl]-2- methylpropan-2-ol 4-Amino-2-ethyl- 1-(2-hydroxy-2- methylpropyl)- 1H-imidazo[4,5- c]quinolin-7-ol 660

1-[4-Amino-2- ethyl-8-(2- morpholin-4- ylethoxy)-1H- imidazo[4,5- c]quinolin-1-yl]-2- methylpropan-2-ol 4-Amino-2-ethyl- 1-(2-hydroxy-2- methylpropyl)- 1H-imidazo[4,5- c]quinolin-8-ol 661

1-[4-Amino-2- (ethoxymethyl)-8- (2-morpholin-4- ylethoxy)-1H- imidazo[4,5- c]quinolin-1-yl]-2- methylpropan-2-ol 4-Amino-2- (ethoxymethyl)- 1-(2-hydroxy-2- methylpropyl)- 1H-imidazo[4,5- c]quinolin-8-ol

Examples 662-664

The general method described in Example 646 can be applied to prepare Examples 662-664, whose structure and names are shown in the table below, from 4-(bromoacetyl)morpholine and the starting materials listed in the table below. The starting materials can be prepared using the methods described in Examples 658-661.

Starting Example Structure Name Material 662

1-[4-Amino-2- ethyl-7-(2- morpholin-4-yl- 2-oxoethoxy)- 1H-imidazo[4,5- c]quinolin-1-yl]- 2-methylpropan- 2-ol 4-Amino-2- ethyl-1-(2- hydroxy-2- methylpropyl)- 1H- imidazo[4,5- c]quinolin-7-ol 663

1-[4-Amino-2- ethyl-8-(2- morpholin-4-yl- 2-oxoethoxy)- 1H-imidazo[4,5- c]quinolin-1-yl]- 2-methylpropan- 2-ol 4-Amino-2- ethyl-1-(2- hydroxy-2- methylpropyl)- 1H- imidazo[4,5- c]quinolin-8-ol 664

1-[4-Amino-2- (ethoxymethyl)- 8-(2-morpholin- 4-yl-2- oxoethoxy)-1H- imidazo[4,5- c]quinolin-1-yl]- 2-methylpropan- 2-ol 4-Amino-2- (ethoxymethyl)- 1-(2-hydroxy-2- methylpropyl)- 1H- imidazo[4,5- c]quinolin-8-ol

Certain exemplary compounds, including some of those described above in the Examples, have the following Formula IIa, IIb, or IIc and the following R₁, R₂, and R₃ substituents, wherein each line of the table is matched with each of Formula IIa, IIb, or IIc to represent a specific embodiment of the invention.

IIa

IIb

IIc

R₁ R₂ R₃ 2-methylpropyl methyl acetyl 2-methylpropyl methyl isobutyryl 2-methylpropyl methyl (isopropylamino)carbonyl 2-methylpropyl methyl methylsulfonyl 2-methylpropyl methyl morpholin-4-ylcarbonyl 2-methylpropyl ethyl acetyl 2-methylpropyl ethyl isobutyryl 2-methylpropyl ethyl (isopropylamino)carbonyl 2-methylpropyl ethyl methylsulfonyl 2-methylpropyl ethyl morpholin-4-ylcarbonyl 2-methylpropyl n-propyl acetyl 2-methylpropyl n-propyl isobutyryl 2-methylpropyl n-propyl (isopropylamino)carbonyl 2-methylpropyl n-propyl methylsulfonyl 2-methylpropyl n-propyl morpholin-4-ylcarbonyl 2-methylpropyl ethoxymethyl acetyl 2-methylpropyl ethoxymethyl isobutyryl 2-methylpropyl ethoxymethyl (isopropylamino)carbonyl 2-methylpropyl ethoxymethyl methylsulfonyl 2-methylpropyl ethoxymethyl morpholin-4-ylcarbonyl 2-methylpropyl 2-hydroxyethyl acetyl 2-methylpropyl 2-hydroxyethyl isobutyryl 2-methylpropyl 2-hydroxyethyl (isopropylamino)carbonyl 2-methylpropyl 2-hydroxyethyl methylsulfonyl 2-methylpropyl 2-hydroxyethyl morpholin-4-ylcarbonyl 2-hydroxy-2-methylpropyl methyl acetyl 2-hydroxy-2-methylpropyl methyl isobutyryl 2-hydroxy-2-methylpropyl methyl (isopropylamino)carbonyl 2-hydroxy-2-methylpropyl methyl methylsulfonyl 2-hydroxy-2-methylpropyl methyl morpholin-4-ylcarbonyl 2-hydroxy-2-methylpropyl ethyl acetyl 2-hydroxy-2-methylpropyl ethyl isobutyryl 2-hydroxy-2-methylpropyl ethyl (isopropylamino)carbonyl 2-hydroxy-2-methylpropyl ethyl methylsulfonyl 2-hydroxy-2-methylpropyl ethyl morpholin-4-ylcarbonyl 2-hydroxy-2-methylpropyl n-propyl acetyl 2-hydroxy-2-methylpropyl n-propyl isobutyryl 2-hydroxy-2-methylpropyl n-propyl (isopropylamino)carbonyl 2-hydroxy-2-methylpropyl n-propyl methylsulfonyl 2-hydroxy-2-methylpropyl n-propyl morpholin-4-ylcarbonyl 2-hydroxy-2-methylpropyl ethoxymethyl acetyl 2-hydroxy-2-methylpropyl ethoxymethyl isobutyryl 2-hydroxy-2-methylpropyl ethoxymethyl (isopropylamino)carbonyl 2-hydroxy-2-methylpropyl ethoxymethyl methylsulfonyl 2-hydroxy-2-methylpropyl ethoxymethyl morpholin-4-ylcarbonyl 2-hydroxy-2-methylpropyl 2-hydroxyethyl acetyl 2-hydroxy-2-methylpropyl 2-hydroxyethyl isobutyryl 2-hydroxy-2-methylpropyl 2-hydroxyethyl (isopropylamino)carbonyl 2-hydroxy-2-methylpropyl 2-hydroxyethyl methylsulfonyl 2-hydroxy-2-methylpropyl 2-hydroxyethyl morpholin-4-ylcarbonyl methyl methyl acetyl methyl methyl isobutyryl methyl methyl (isopropylamino)carbonyl methyl methyl methylsulfonyl methyl methyl morpholin-4-ylcarbonyl methyl ethyl acetyl methyl ethyl isobutyryl methyl ethyl (isopropylamino)carbonyl methyl ethyl methylsulfonyl methyl ethyl morpholin-4-ylcarbonyl methyl n-propyl acetyl methyl n-propyl isobutyryl methyl n-propyl (isopropylamino)carbonyl methyl n-propyl methylsulfonyl methyl n-propyl morpholin-4-ylcarbonyl methyl ethoxymethyl acetyl methyl ethoxymethyl isobutyryl methyl ethoxymethyl (isopropylamino)carbonyl methyl ethoxymethyl methylsulfonyl methyl ethoxymethyl morpholin-4-ylcarbonyl methyl 2-hydroxyethyl acetyl methyl 2-hydroxyethyl isobutyryl methyl 2-hydroxyethyl (isopropylamino)carbonyl methyl 2-hydroxyethyl methylsulfonyl methyl 2-hydroxyethyl morpholin-4-ylcarbonyl n-propyl methyl acetyl n-propyl methyl isobutyryl n-propyl methyl (isopropylamino)carbonyl n-propyl methyl methylsulfonyl n-propyl methyl morpholin-4-ylcarbonyl n-propyl ethyl acetyl n-propyl ethyl isobutyryl n-propyl ethyl (isopropylamino)carbonyl n-propyl ethyl methylsulfonyl n-propyl ethyl morpholin-4-ylcarbonyl n-propyl n-propyl acetyl n-propyl n-propyl isobutyryl n-propyl n-propyl (isopropylamino)carbonyl n-propyl n-propyl methylsulfonyl n-propyl n-propyl morpholin-4-ylcarbonyl n-propyl ethoxymethyl acetyl n-propyl ethoxymethyl isobutyryl n-propyl ethoxymethyl (isopropylamino)carbonyl n-propyl ethoxymethyl methylsulfonyl n-propyl ethoxymethyl morpholin-4-ylcarbonyl n-propyl 2-hydroxyethyl acetyl n-propyl 2-hydroxyethyl isobutyryl n-propyl 2-hydroxyethyl (isopropylamino)carbonyl n-propyl 2-hydroxyethyl methylsulfonyl n-propyl 2-hydroxyethyl morpholin-4-ylcarbonyl tetrahydro-2H-pyran-4- methyl acetyl ylmethyl tetrahydro-2H-pyran-4- methyl isobutyryl ylmethyl tetrahydro-2H-pyran-4- methyl (isopropylamino)carbonyl ylmethyl tetrahydro-2H-pyran-4- methyl methylsulfonyl ylmethyl tetrahydro-2H-pyran-4- methyl morpholin-4-ylcarbonyl ylmethyl tetrahydro-2H-pyran-4- ethyl acetyl ylmethyl tetrahydro-2H-pyran-4- ethyl isobutyryl ylmethyl tetrahydro-2H-pyran-4- ethyl (isopropylamino)carbonyl ylmethyl tetrahydro-2H-pyran-4- ethyl methylsulfonyl ylmethyl tetrahydro-2H-pyran-4- ethyl morpholin-4-ylcarbonyl ylmethyl tetrahydro-2H-pyran-4- n-propyl acetyl ylmethyl tetrahydro-2H-pyran-4- n-propyl isobutyryl ylmethyl tetrahydro-2H-pyran-4- n-propyl (isopropylamino)carbonyl ylmethyl tetrahydro-2H-pyran-4- n-propyl methylsulfonyl ylmethyl tetrahydro-2H-pyran-4- n-propyl morpholin-4-ylcarbonyl ylmethyl tetrahydro-2H-pyran-4- ethoxymethyl acetyl ylmethyl tetrahydro-2H-pyran-4- ethoxymethyl isobutyryl ylmethyl tetrahydro-2H-pyran-4- ethoxymethyl (isopropylamino)carbonyl ylmethyl tetrahydro-2H-pyran-4- ethoxymethyl methylsulfonyl ylmethyl tetrahydro-2H-pyran-4- ethoxymethyl morpholin-4-ylcarbonyl ylmethyl tetrahydro-2H-pyran-4- 2-hydroxyethyl acetyl ylmethyl tetrahydro-2H-pyran-4- 2-hydroxyethyl isobutyryl ylmethyl tetrahydro-2H-pyran-4- 2-hydroxyethyl (isopropylamino)carbonyl ylmethyl tetrahydro-2H-pyran-4- 2-hydroxyethyl methylsulfonyl ylmethyl tetrahydro-2H-pyran-4- 2-hydroxyethyl morpholin-4-ylcarbonyl ylmethyl

Certain exemplary compounds, including some of those described above in the Examples, have the following Formula IIIa or IIIb and the following R₁ and R₂ substituents, wherein each line of the table is matched with each of Formula IIIa or IIIb to represent a specific embodiment of the invention.

IIIa

IIIb

R₁ R₂ 2-methylpropyl methyl 2-methylpropyl ethyl 2-methylpropyl n-propyl 2-methylpropyl ethoxymethyl 2-methylpropyl 2-hydroxyethyl 2-hydroxy-2-methylpropyl methyl 2-hydroxy-2-methylpropyl ethyl 2-hydroxy-2-methylpropyl n-propyl 2-hydroxy-2-methylpropyl ethoxymethyl 2-hydroxy-2-methylpropyl 2-hydroxyethyl methyl methyl methyl ethyl methyl n-propyl methyl ethoxymethyl methyl 2-hydroxyethyl n-propyl methyl n-propyl ethyl n-propyl n-propyl n-propyl ethoxymethyl n-propyl 2-hydroxyethyl tetrahydro-2H-pyran-4-ylmethyl methyl tetrahydro-2H-pyran-4-ylmethyl ethyl tetrahydro-2H-pyran-4-ylmethyl n-propyl tetrahydro-2H-pyran-4-ylmethyl ethoxymethyl tetrahydro-2H-pyran-4-ylmethyl 2-hydroxyethyl

Certain exemplary compounds, including some of those described above in the Examples, have the following Formula VIa or VIb and the following R₁, R₂, and R₃ substituents, wherein each line of the table is matched with each of Formula VIa or VIb to represent a specific embodiment of the invention.

VIa

VIb

R₁ R₂ R₃ 2-methylpropyl methyl morpholin-4-yl 2-methylpropyl methyl piperdin-1-yl 2-methylpropyl methyl pyrrolidin-1-yl 2-methylpropyl ethyl morpholin-4-yl 2-methylpropyl ethyl piperdin-1-yl 2-methylpropyl ethyl pyrrolidin-1-yl 2-methylpropyl n-propyl morpholin-4-yl 2-methylpropyl n-propyl piperdin-1-yl 2-methylpropyl n-propyl pyrrolidin-1-yl 2-methylpropyl ethoxymethyl morpholin-4-yl 2-methylpropyl ethoxymethyl piperdin-1-yl 2-methylpropyl ethoxymethyl pyrrolidin-1-yl 2-methylpropyl 2-hydroxyethyl morpholin-4-yl 2-methylpropyl 2-hydroxyethyl piperdin-1-yl 2-methylpropyl 2-hydroxyethyl pyrrolidin-1-yl 2-hydroxy-2-methylpropyl methyl morpholin-4-yl 2-hydroxy-2-methylpropyl methyl piperdin-1-yl 2-hydroxy-2-methylpropyl methyl pyrrolidin-1-yl 2-hydroxy-2-methylpropyl ethyl morpholin-4-yl 2-hydroxy-2-methylpropyl ethyl piperdin-1-yl 2-hydroxy-2-methylpropyl ethyl pyrrolidin-1-yl 2-hydroxy-2-methylpropyl n-propyl morpholin-4-yl 2-hydroxy-2-methylpropyl n-propyl piperdin-1-yl 2-hydroxy-2-methylpropyl n-propyl pyrrolidin-1-yl 2-hydroxy-2-methylpropyl ethoxymethyl morpholin-4-yl 2-hydroxy-2-methylpropyl ethoxymethyl piperdin-1-yl 2-hydroxy-2-methylpropyl ethoxymethyl pyrrolidin-1-yl 2-hydroxy-2-methylpropyl 2-hydroxyethyl morpholin-4-yl 2-hydroxy-2-methylpropyl 2-hydroxyethyl piperdin-1-yl 2-hydroxy-2-methylpropyl 2-hydroxyethyl pyrrolidin-1-yl methyl methyl morpholin-4-yl methyl methyl piperdin-1-yl methyl methyl pyrrolidin-1-yl methyl ethyl morpholin-4-yl methyl ethyl piperdin-1-yl methyl ethyl pyrrolidin-1-yl methyl n-propyl morpholin-4-yl methyl n-propyl piperdin-1-yl methyl n-propyl pyrrolidin-1-yl methyl ethoxymethyl morpholin-4-yl methyl ethoxymethyl piperdin-1-yl methyl ethoxymethyl pyrrolidin-1-yl methyl 2-hydroxyethyl morpholin-4-yl methyl 2-hydroxyethyl piperdin-1-yl methyl 2-hydroxyethyl pyrrolidin-1-yl n-propyl methyl morpholin-4-yl n-propyl methyl piperdin-1-yl n-propyl methyl pyrrolidin-1-yl n-propyl ethyl morpholin-4-yl n-propyl ethyl piperdin-1-yl n-propyl ethyl pyrrolidin-1-yl n-propyl n-propyl morpholin-4-yl n-propyl n-propyl piperdin-1-yl n-propyl n-propyl pyrrolidin-1-yl n-propyl ethoxymethyl morpholin-4-yl n-propyl ethoxymethyl piperdin-1-yl n-propyl ethoxymethyl pyrrolidin-1-yl n-propyl 2-hydroxyethyl morpholin-4-yl n-propyl 2-hydroxyethyl piperdin-1-yl n-propyl 2-hydroxyethyl pyrrolidin-1-yl tetrahydro-2H-pyran-4-ylmethyl methyl morpholin-4-yl tetrahydro-2H-pyran-4-ylmethyl methyl piperdin-1-yl tetrahydro-2H-pyran-4-ylmethyl methyl pyrrolidin-1-yl tetrahydro-2H-pyran-4-ylmethyl ethyl morpholin-4-yl tetrahydro-2H-pyran-4-ylmethyl ethyl piperdin-1-yl tetrahydro-2H-pyran-4-ylmethyl ethyl pyrrolidin-1-yl tetrahydro-2H-pyran-4-ylmethyl n-propyl morpholin-4-yl tetrahydro-2H-pyran-4-ylmethyl n-propyl piperdin-1-yl tetrahydro-2H-pyran-4-ylmethyl n-propyl pyrrolidin-1-yl tetrahydro-2H-pyran-4-ylmethyl ethoxymethyl morpholin-4-yl tetrahydro-2H-pyran-4-ylmethyl ethoxymethyl piperdin-1-yl tetrahydro-2H-pyran-4-ylmethyl ethoxymethyl pyrrolidin-1-yl tetrahydro-2H-pyran-4-ylmethyl 2-hydroxyethyl morpholin-4-yl tetrahydro-2H-pyran-4-ylmethyl 2-hydroxyethyl piperdin-1-yl tetrahydro-2H-pyran-4-ylmethyl 2-hydroxyethyl pyrrolidin-1-yl

Compounds of the invention were found to induce or inhibit cytokine biosynthesis when tested using the methods described below.

Cytokine Induction in Human Cells

Compounds of the invention have been found to modulate cytokine biosynthesis by inducing the production of interferon α and/or tumor necrosis factor α when tested using the method described below. Particular examples include, but are not limited to, the compounds of Examples 1-9, 11, 13-22, 26-37, 40-43, 45-134, 139, 143, 146-149, 151, 154-156, 160, 162-201, 204-206, 209, 210, 212, 214-216, 218-220, 222-224, 226-230, 233-256, 258-261, 263-278, 280-306, 308-320, 322-335, 338-355, 358, 359, 361, 364-373, 376-394, 397-405, 407-409, 411-414, and 418-422.

An in vitro human blood cell system is used to assess cytokine induction. Activity is based on the measurement of interferon (α) and tumor necrosis factor (α) (IFN and TNF, respectively) secreted into culture media as described by Testerman et al. in “Cytokine Induction by the Immunomodulators Imiquimod and S-27609”, Journal of Leukocyte Biology, 58, 365-372 (September, 1995).

Blood Cell Preparation for Culture

Whole blood from healthy human donors is collected by venipuncture into EDTA vacutainer tubes. Peripheral blood mononuclear cells (PBMC) are separated from whole blood by density gradient centrifugation using HISTOPAQUE-1077. Blood is diluted 1:1 with Dulbecco's Phosphate Buffered Saline (DPBS) or Hank's Balanced Salts Solution (HBSS). The PBMC layer is collected and washed twice with DPBS or HBSS and resuspended at 4×10⁶ cells/mL in RPMI complete. The PBMC suspension is added to 48 well flat bottom sterile tissue culture plates (Costar, Cambridge, Mass. or Becton Dickinson Labware, Lincoln Park, N.J.) containing an equal volume of RPMI complete media containing test compound.

Compound Preparation

The compounds are solubilized in dimethyl sulfoxide (DMSO). The DMSO concentration should not exceed a final concentration of 1% for addition to the culture wells. The compounds are generally tested at concentrations ranging from 30-0.014 μM.

Incubation

The solution of test compound is added at 60 μM to the first well containing RPMI complete and serial 3 fold dilutions are made in the wells. The PBMC suspension is then added to the wells in an equal volume, bringing the test compound concentrations to the desired range (30-0.014 μM). The final concentration of PBMC suspension is 2×10⁶ cells/mL. The plates are covered with sterile plastic lids, mixed gently and then incubated for 18 to 24 hours at 37° C. in a 5% carbon dioxide atmosphere.

Separation

Following incubation the plates are centrifuged for 10 minutes at 1000 rpm (approximately 200×g) at 4° C. The cell-free culture supernatant is removed with a sterile polypropylene pipet and transferred to sterile polypropylene tubes. Samples are maintained at −30 to −70° C. until analysis. The samples are analyzed for interferon (α) by ELISA and for tumor necrosis factor (α) by ELISA or IGEN Assay.

Interferon (α) and Tumor Necrosis Factor (α) Analysis by ELISA

Interferon (α) concentration is determined by ELISA using a Human Multi-Species kit from PBL Biomedical Laboratories, New Brunswick, N.J. Results are expressed in pg/mL.

Tumor necrosis factor (α) (TNF) concentration is determined using ELISA kits available from Biosource International, Camarillo, Calif. Alternately, the TNF concentration can be determined by ORIGEN M-Series Immunoassay and read on an IGEN M-8 analyzer from IGEN International, Gaithersburg, Md. The immunoassay uses a human TNF capture and detection antibody pair from Biosource International, Camarillo, Calif. Results are expressed in pg/mL.

TNF-α Inhibition in Mouse Cells

Certain compounds of the invention may modulate cytokine biosynthesis by inhibiting production of tumor necrosis factor α (TNF-α) when tested using the method described below. Particular examples, include but are not limited to, the compounds of Examples 134-136, 139, 142, 143, 146-151, 153, 155-161, 218-224, 226-242, 323-326, 328-333, 336, 337, 355-357, and 362.

The mouse macrophage cell line Raw 264.7 is used to assess the ability of compounds to inhibit tumor necrosis factor-α (TNF-α) production upon stimulation by lipopolysaccharide (LPS).

Single Concentration Assay:

Blood Cell Preparation for Culture

Raw cells (ATCC) are harvested by gentle scraping and then counted. The cell suspension is brought to 3×10⁵ cells/mL in RPMI with 10% fetal bovine serum (FBS). Cell suspension (100 μL) is added to 96-well flat bottom sterile tissues culture plates (Becton Dickinson Labware, Lincoln Park, N.J.). The final concentration of cells is 3×10⁴ cells/well. The plates are incubated for 3 hours. Prior to the addition of test compound the medium is replaced with colorless RPMI medium with 3% FBS.

Compound Preparation

The compounds are solubilized in dimethyl sulfoxide (DMSO). The DMSO concentration should not exceed a final concentration of 1% for addition to the culture wells. Compounds are tested at 5 μM. LPS (Lipopolysaccaride from Salmonella typhimurium, Sigma-Aldrich) is diluted with colorless RPMI to the EC₇₀ concentration as measured by a dose response assay.

Incubation

A solution of test compound (1 μl) is added to each well. The plates are mixed on a microtiter plate shaker for 1 minute and then placed in an incubator. Twenty minutes later the solution of LPS (1 μL, EC₇₀ concentration ˜10 ng/ml) is added and the plates are mixed for 1 minute on a shaker. The plates are incubated for 18 to 24 hours at 37° C. in a 5% carbon dioxide atmosphere.

TNF-α Analysis

Following the incubation the supernatant is removed with a pipet. TNF-α concentration is determined by ELISA using a mouse TNF-α kit (from Biosource International, Camarillo, Calif.). Results are expressed in pg/mL. TNF-α expression upon LPS stimulation alone is considered a 100% response.

Dose Response Assay:

Blood Cell Preparation for Culture

Raw cells (ATCC) are harvested by gentle scraping and then counted. The cell suspension is brought to 4×10⁵ cells/mL in RPMI with 10% FBS. Cell suspension (250 μL) is added to 48-well flat bottom sterile tissues culture plates (Costar, Cambridge, Mass.). The final concentration of cells is 1×10⁵ cells/well. The plates are incubated for 3 hours. Prior to the addition of test compound the medium is replaced with colorless RPMI medium with 3% FBS.

Compound Preparation

The compounds are solubilized in dimethyl sulfoxide (DMSO). The DMSO concentration should not exceed a final concentration of 1% for addition to the culture wells. Compounds are tested at 0.03, 0.1, 0.3, 1, 3, 5 and 10 μM. LPS (Lipopolysaccaride from Salmonella typhimurium, Sigma-Aldrich) is diluted with colorless RPMI to the EC₇₀ concentration as measured by dose response assay.

Incubation

A solution of test compound (200 μL) is added to each well. The plates are mixed on a microtiter plate shaker for 1 minute and then placed in an incubator. Twenty minutes later the solution of LPS (200 μL, EC₇₀ concentration ˜10 ng/ml) is added and the plates are mixed for 1 minute on a shaker. The plates are incubated for 18 to 24 hours at 37° C. in a 5% carbon dioxide atmosphere.

TNF-α Analysis

Following the incubation the supernatant is removed with a pipet. TNF-α concentration is determined by ELISA using a mouse TNF-α kit (from Biosource International, Camarillo, Calif.). Results are expressed in pg/mL. TNF-α expression upon LPS stimulation alone is considered a 100% response.

The complete disclosures of the patents, patent documents, and publications cited herein are incorporated by reference in their entirety as if each were individually incorporated. The present invention has been described with reference to several embodiments thereof. The foregoing illustrative embodiments and examples have been provided for clarity of understanding only, and no unnecessary limitations are to be understood therefrom. It will be apparent to those skilled in the art that many changes can be made to the described embodiments without departing from the spirit and scope of the invention. Thus, the scope of the invention is intended to be limited only by the claims that follow. 

What is claimed is:
 1. A compound of the formula (II):

wherein: R₃ is selected from the group consisting of —Z—Y₃—R₄₋₃, —Z—Y₃—X₃—Y₃—R₄₋₃, —Z-Het, —Z-Het′-R₄, and —Z-Het′-Y—R₄; Z is selected from the group consisting of alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups; Y₃ is selected from the group consisting of: —S(O)₀₋₂—, —C(R₆)—, —C(R₆)—O—, —O—C(R₆)—, and —O—C(O)—O—; R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl; n is 0 or 1; R₁ is selected from the group consisting of alkyl, alkoxyalkylenyl, aminoalkylenyl, hydroxyalkylenyl, dihydroxyalkylenyl and alkyl substituted by a group selected from the group consisting of —NH—C(O)-alkyl, —NH—S(O)₂-alkyl, —NH—C(O)—NH-alkyl, —NH—C(O)—O-alkyl, phenoxy, tetrahydropyranyl, 1,1-dioxidoisothiazolidin-2-yl, and 2,2-dimethyl-1,3-dioxolan-4-yl; R₂ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and hydroxyalkylenyl; X₃ is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, heteroarylene, and heterocyclylene wherein the alkylene, alkenylene, and alkynylene groups can be optionally interrupted or terminated with arylene, heteroarylene, or heterocyclylene, and optionally interrupted by one or more —O— groups, wherein heterocyclylene is non-aromatic and contains at least one ring heteroatom, wherein the at least one ring heteroatom is selected from the group consisting of an oxygen atom and a sulfur atom; Y is selected from the group consisting of —S(O)₀₋₂—, —S(O)₂—N(R₈)—, —C(R₆)—, —C(R₆)—O—, —O—C(R₆)—, —O—C(O)—O—, —N(R₈)-Q-, —C(R₆)—N(R₈)—, —O—C(R₆)—N(R₈)—, —C(R₆)—N(OR₉)—,

R₄ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo; R₄₋₃ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo, wherein heterocyclyl is non-aromatic and contains at least one ring heteroatom, and wherein the at least one ring heteroatom is selected from the group consisting of an oxygen atom and a sulfur atom; R₆ is selected from the group consisting of ═O and ═S; R₇ is C₂₋₇ alkylene; R₈ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and arylalkylenyl; R₉ is selected from the group consisting of hydrogen and alkyl; R₁₀ is C₃₋₈ alkylene; Het is a non-aromatic heterocyclyl that contains at least one ring heteroatom, wherein the at least one ring heteroatom is selected from the group consisting of an oxygen atom and a sulfur atom, and wherein the non-aromatic heterocyclyl can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, hydroxyalkyl, mercapto, cyano, aryloxy, arylalkyleneoxy, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, hydroxyalkyleneoxyalkylenyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and oxo; Het′ is a non-aromatic heterocyclylene that contains at least one ring heteroatom, wherein the at least one ring heteroatom is selected from the group consisting of an oxygen atom and a sulfur atom, and wherein the non-aromatic heterocyclyl can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, hydroxyalkyl, mercapto, cyano, aryloxy, arylalkyleneoxy, heteroaryloxy, heteroarylalkyleneoxy, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and oxo; Q is selected from the group consisting of a bond, —C(R₆)—, —C(R₆)—C(R₆)—, —S(O)₂—, —C(R₆)—N(R₈)—W—, —S(O)₂—N(R₈)—, —C(R₆)—O—, and —C(R₆)—N(OR₉)—; V is selected from the group consisting of —C(R₆)—, —O—C(R₆)—, —N(R₈)—C(R₆)—, and —S(O)₂—; W is selected from the group consisting of a bond, —C(O)—, and —S(O)₂—; and with the proviso that Z can also be a bond when: R₃ is —Z-Het, —Z-Het′-R₄, or —Z-Het′-Y—R₄; or R₃ is —Z—Y₃—R₄ or —Z—Y₃—X—Y₃—R₄, and Y₃ is selected from —S(O)₀₋₂—, —C(R₆)—, and —C(R₆)—O—; or a pharmaceutically acceptable salt thereof.
 2. The compound or salt of claim 1, wherein R₃ is —Z—Y₃—R₄₋₃.
 3. The compound or salt of claim 1, wherein Y₃ is selected from the group consisting of —S(O)₀₋₂— —C(O)—, —C(O)—O—, and —O—C(O)—; and R₄₋₃ is selected from the group consisting of hydrogen, alkyl, alkenyl, aryl, arylalkylenyl, alkylheteroarylenyl, heteroarylalkylenyl, aryloxyalkylenyl, heteroaryl, and heterocyclyl, wherein alkyl is unsubstituted or substituted by one or more substituents selected from the group consisting of hydroxy, alkoxy, and heterocyclyl, and wherein arylalkylenyl and heteroarylalkylenyl are unsubstituted or substituted by one or more substituents selected from the group consisting of alkyl, halogen, and alkoxy, wherein heterocyclyl is non-aromatic and contains at least one ring heteroatom, and wherein the at least one ring heteroatom is selected from the group consisting of an oxygen atom and a sulfur atom.
 4. The compound or salt of claim 1, wherein R₃ is —Z-Het, —Z-Het′-R₄, or —Z-Het′-Y—R₄.
 5. The compound or salt of claim 4, wherein Z is a bond.
 6. The compound or salt of claim 4, wherein Het or Het′ is selected from the group consisting of tetrahydropyranyl, tetrahydrofuranyl, and 1,3-dioxolanyl.
 7. The compound or salt of claim 4, wherein Het is substituted by one or more substituents selected from the group consisting of alkyl, hydroxyl, hydroxyalkyl, hydroxyalkyleneoxyalkylenyl, diakylamino, and heterocyclyl; Y is selected from the group consisting of —C(O)—, —C(O)—O—, —C(O)—N(H)—, and —N(H)—C(O)—; and R₄ is selected from the group consisting of hydrogen and alkyl.
 8. The compound or salt of claim 1, wherein Z is alkylene.
 9. A compound of the formula (VI):

wherein: R₃₋₄ is selected from the group consisting of —Z_(a)—C(R₆)—R₄₋₃, and —Z_(a)—C(R₆)—O—R₄₋₃; Z_(a) is selected from the group consisting of a bond, alkylene, alkenylene, and alkynylene, wherein alkylene, alkenylene, and alkynylene can be optionally interrupted with one or more —O— groups; R is selected from the group consisting of alkyl, alkoxy, hydroxy, halogen, and trifluoromethyl; n is 0 or 1; R₁ is selected from the group consisting of alkyl, alkoxyalkylenyl, aminoalkylenyl, hydroxyalkylenyl, dihydroxyalkylenyl and alkyl substituted by a group selected from the group consisting of —NH—C(O)-alkyl, —NH—S(O)₂-alkyl, —NH—C(O)—NH-alkyl, —NH—C(O)—O-alkyl, phenoxy, tetrahydropyranyl, 1,1-dioxidoisothiazolidin-2-yl, and 2,2-dimethyl-1,3-dioxolan-4-yl; R₂ is selected from the group consisting of hydrogen, alkyl, alkoxyalkylenyl, and hydroxyalkylenyl; R₄₋₃ is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl wherein the alkyl, alkenyl, alkynyl, aryl, arylalkylenyl, aryloxyalkylenyl, alkylarylenyl, heteroaryl, heteroarylalkylenyl, heteroaryloxyalkylenyl, alkylheteroarylenyl, and heterocyclyl groups can be unsubstituted or substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxy, hydroxyalkyl, haloalkyl, haloalkoxy, halogen, nitro, hydroxy, mercapto, cyano, aryl, aryloxy, arylalkyleneoxy, heteroaryl, heteroaryloxy, heteroarylalkyleneoxy, heterocyclyl, amino, alkylamino, dialkylamino, (dialkylamino)alkyleneoxy, and in the case of alkyl, alkenyl, alkynyl, and heterocyclyl, oxo, wherein heterocyclyl is non-aromatic and contains at least one ring heteroatom, and wherein the at least one ring heteroatom is selected from the group consisting of an oxygen atom and a sulfur atom; R₆ is selected from the group consisting of ═O and ═S; or a pharmaceutically acceptable salt thereof.
 10. The compound or salt of claim 9, wherein R₃₋₄ is —Z_(a)—C(R₆)—R₄₋₃, R₆ is ═O or ═S, and R₄₋₃ is alkyl or aryl.
 11. The compound or salt of claim 9, wherein R₃₋₄ is —Z_(a)—C(R₆)—O—R₄₋₃, R₆ is ═O and R₄₋₃ is hydrogen or alkyl.
 12. The compound or salt of claim 9, wherein Z_(a) is a bond or alkylene.
 13. The compound or salt of claim 1, wherein n is
 0. 14. The compound or salt of claim 1, wherein R₁ is selected from the group consisting of 2-hydroxy-2-methylpropyl, 2-methylpropyl, propyl, ethyl, methyl, 2,3-dihydroxypropyl, 2-phenoxyethyl, 4-[(methylsulfonyl)amino]butyl, 2-methyl-2-[(methylsulfonyl)amino]propyl, 2-(acetylamino)-2-methylpropyl, 2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl, 4-{[(isopropylamino)carbonyl]amino}butyl, 4-(1,1-dioxidoisothiazolidin-2-yl)butyl, tetrahydro-2H-pyran-4-ylmethyl, and (2,2-dimethyl-1,3-dioxolan-4-yl)methyl.
 15. The compound or salt of claim 1, wherein R₂ is selected from the group consisting of hydrogen, methyl, ethyl, propyl, butyl, ethoxymethyl, methoxymethyl, 2-methoxyethyl, hydroxymethyl, and 2-hydroxyethyl.
 16. A pharmaceutical composition comprising a therapeutically effective amount of a compound or salt of claim 1 in combination with a pharmaceutically acceptable carrier.
 17. A method of inducing cytokine biosynthesis in an animal comprising administering an effective amount of a compound or salt of claim 1 to the animal.
 18. The compound or salt of claim 9, wherein n is
 0. 19. The compound or salt of claim 9, wherein R₁ is selected from the group consisting of 2-hydroxy-2-methylpropyl, 2-methylpropyl, propyl, ethyl, methyl, 2,3-dihydroxypropyl, 2-phenoxyethyl, 4-[(methylsulfonyl)amino]butyl, 2-methyl-2-[(methylsulfonyl)amino]propyl, 2-(acetylamino)-2-methylpropyl, 2-{[(isopropylamino)carbonyl]amino}-2-methylpropyl, 4-{[(isopropylamino)carbonyl]amino}butyl, 4-(1,1-dioxidoisothiazolidin-2-yl)butyl, tetrahydro-2H-pyran-4-ylmethyl, and (2,2-dimethyl-1,3-dioxolan-4-yl)methyl.
 20. The compound or salt of claim 9, wherein R₂ is selected from the group consisting of hydrogen, methyl, ethyl, propyl, butyl, ethoxymethyl, methoxymethyl, 2-methoxyethyl, hydroxymethyl, and 2-hydroxyethyl. 